Skip to main content

Compound Groups

Compound groups are groups of chemicals that share structural or chemical features. In most cases, hazard lists will assign hazards to individual substances. Compound groups are useful because in some cases, lists will instead identify a group of structurally similar compounds (such as lead compounds) as all having the same hazard. The Pharos staff is in the process of establishing and populating compound groups, and associating warnings from the hazard lists with them. The table below indicates how each compound group is populated, and what is the status of its population.
Compound Groups
COMPOUND GROUP NAME POPULATION STATUS DATE POPULATED DESCRIPTION PROFILE TYPE # MEMBERS # HAZARDS
Naphthenic oils (petroleum), dewaxed light and heavy, Baseoil - unspecified incomplete This compound group has not yet been assigned a structural definition. other 4 0
National Health and Nutrition Examination Survey (NHANES) Chemical List complete 07/27/20

This list was copied from https://comptox.epa.gov/dashboard/chemical_lists/NHANES2019

fixed list 517 0
Natural gas (petroleum), condensates - unspecified incomplete This compound group has not yet been assigned a structural definition. other 5 0
Neodymium and its salts incomplete This compound group has not yet been assigned a structural definition. structure 1 1
Neostigmine and its salts incomplete This compound group has not yet been assigned a structural definition. structure 2 1
Nerium oleander its extracts and its glycosides, Oleandrin incomplete This compound group has not yet been assigned a structural definition. structure 1 1
Nickel (soluble compounds) incomplete other 0 3
Nickel acetate similar soluble salts incomplete This compound group has not yet been assigned a structural definition. other 1 29
Nickel bis(sulfate)s incomplete This compound group is defined by the SMILES string '[Ni+2].[O-]S(=O)(=O)[O-]'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system. other 2 0
Nickel borides incomplete This compound group has not yet been assigned a structural definition. other 5 0
Nickel carbonates incomplete This compound group is defined by the SMILES string '[Ni+2].C(=O)([OX1-])[OX1-]'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system. other 5 0
NICKEL COMPOUNDS in progress This compound group is defined by the SMILES string '[Ni]'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system. element 1133 29
Nickel compounds, inorganic complete

This compound group is defined by the SMILES/SMARTS string "[Ni] subtract [Ni].C" and populated from a substructure search of PubChem. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system.

structure 509 1
NICKEL COMPOUNDS, INSOLUBLE incomplete This compound group has not yet been assigned a structural definition. other 0 29
Nickel compounds, oxidic complete

This compound group is defined by the SMILES/SMARTS string "O=[Ni]" and populated from a substructure search of PubChem. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system.

"including nickel oxide, nickel-copper oxide, nickel silicate oxides, and complex oxides"

https://www.canada.ca/en/health-canada/services/environmental-workplace-health/reports-publications/environmental-contaminants/canadian-environmental-protection-act-priority-substances-list-assessment-report-nickel-compounds.html

structure 29 30
NICKEL COMPOUNDS, SOLUBLE incomplete This group was populated based on: http://www.osha.gov/SLTC/healthguidelines/nickelsolublecompounds/recognition.html other 5 30
Nickel Compounds, Soluble (MAK list) complete

This compound group has been populated using subgroups listed by MAK Commission of Germany.

fixed list 11 31
Nickel compounds, sulfidic incomplete This compound group has not yet been assigned a structural definition. structure 6 30
Nickel formates incomplete This compound group is defined by the SMILES string '[Ni+2].[CH1](=O)[O-]'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system. other 3 0
Nickel halides incomplete This compound group is defined by the SMILES string '[Ni+2].[F,Cl,Br,I;X0-]'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system. other 4 0
Nickel hydroxides incomplete This compound group is defined by the SMILES string '[Ni+2].[OX1H-]'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system. other 3 0
Nickel nitrates incomplete This compound group is defined by the SMILES string '[Ni+2].[N+](=O)([O-])[O-]'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system. other 3 0
Nickel oxalates incomplete This compound group is defined by the SMILES string '[Ni+2].C(=O)(C(=O)[O-])[O-]'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system. other 2 1
Nickel phosphates and phosphinates incomplete This compound group is defined by the SMILES string 'Phosphate: [O-]P(=O)([O-])[O-].[Ni+2] Phosphide...'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system. other 7 0
Nickel phosphides incomplete This compound group has not yet been assigned a structural definition. other 1 0
Nickel silicates incomplete This compound group has not yet been assigned a structural definition. other 7 1
Nickel silicides incomplete This compound group has not yet been assigned a structural definition. other 4 0
Nickel, other organic compounds incomplete This compound group is defined by the SMILES string 'C[Ni]'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system. structure 31 0
Nitrate compounds (water dissociable) 0 1
Nitrilotriacetic acid sodium salts incomplete

This compound group is defined by the SMILES string 'C(C(=O)O)N(CC(=O)O)CC(=O)O'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system.

other 5 3
Nitrites, inorganic, except sodium nitrite incomplete This compound group has not yet been assigned a structural definition. structure 1 1
Nitro PAHS incomplete This compound group has not yet been assigned a structural definition. other 9 0
Nitrocresols and their alkali metal salts incomplete This compound group has not yet been assigned a structural definition. structure 1 1
Nitrophenols incomplete This compound group has not yet been assigned a structural definition. other 8 0
Nitropyrene compounds incomplete This compound group has not yet been assigned a structural definition. other 4 1
Nitrosamines incomplete

This compound group is defined by the SMILES string 'NN=O'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system.

other 23 1
nitrotoluidines incomplete

This compound group has not yet been assigned a structural definition.

structure 1 0
nitrotoluidines, with the exception of those specified elsewhere in Annex VI of Regulation (EC) No 1272/2008 incomplete

This compound group is populated by taking the more general compound group and subtracting the chemicals found in the relevent Annex.

other 0 5
Nitrous acid, salts incomplete

This compound group has not yet been assigned a structural definition.

other 0 3
Nitroxoline and its salts incomplete This compound group has not yet been assigned a structural definition. structure 1 1
Non Halogenated Flame Retardants incomplete

This compound group has not yet been assigned a structural definition.

functional use 238 6
Non hexavalent chromium compounds excluding Chromium III oxides 0 1
Non-arsenical insecticides (occupational exposures in spraying and application of) incomplete

This compound group has not yet been assigned a structural definition.

0 2
Non-chlorinated Phenols incomplete This compound group has not yet been assigned a structural definition. other 2 0
Non-halogenated aromatic phosphates - Biomonitoring CA incomplete

This group is populated from the list at https://biomonitoring.ca.gov/chemicals

fixed list 0 4
Nonabromobiphenyls (NonaBBs) complete 09/05/25 fixed list 3 51
Nonabromodiphenylethers (NonaBDEs) complete 09/05/25 fixed list 3 41
Nonadecafluorodecanoic acid (PFDA) and its sodium and ammonium salts complete 02/27/23

ECHA chemical group parent

3 7
Nonphenol Ethoxylates (TRI Category) 03/09/21

This compound group was populated using a list of chemicals that are reportable under the MA Toxics Use Reduction Act (TURA). See https://www.mass.gov/guides/massdep-toxics-use-reduction-program#-listed-chemicals- for more information.

fixed list 205 43
Nonphenols (TRI Category) 03/09/21

This compound group was populated using a list of chemicals that are reportable under the MA Toxics Use Reduction Act (TURA). See https://www.mass.gov/guides/massdep-toxics-use-reduction-program#-listed-chemicals- for more information.

fixed list 9 35
Nonylphenol ethoxylates (NPEs) incomplete

This compound group was populated from reports provided by the US EPA, Canadian government, and ECHA, as well as searches for 'nonylphenol' in the ECHA C&L Inventory, PubChem and the 2016 GADSL list.

https://www.canada.ca/en/environment-climate-change/services/national-pollutant-release-inventory/report/sector-specific-tools-calculate-emissions/list-nonylphenol-ethoxylates.html

https://www.epa.gov/toxics-release-inventory-tri-program/addition-npes-category-tri-list-proposed-rule

http://echa.europa.eu/documents/10162/f24cf2d8-11d5-4495-9e18-065b34e94e0b

https://echa.europa.eu/information-on-chemicals/cl-inventory-database

https://pubchem.ncbi.nlm.nih.gov/

http://www.gadsl.org/

other 326 42
Nonylphenol, branched and linear, ethoxylated, EO =< 11 mol incomplete

This compound group has not yet been assigned a structural definition.

other 0 42
Nonylphenol, branched and linear, ethoxylated, EO > 11 mol incomplete

This compound group has not yet been assigned a structural definition.

other 0 42
Nonylphenols incomplete This compound group has not yet been assigned a structural definition. other 82 34
Nonylphenols and Nonylphenol Ethoxylates (NP/NPEs) incomplete

This compound group has not yet been assigned a structural definition.

other 392 20
Noradrenaline and its salts incomplete This compound group has not yet been assigned a structural definition. structure 1 1
Noscapine and its salts incomplete This compound group has not yet been assigned a structural definition. structure 1 1
o-dianisidine based azo dyes; 4,4'-diarylazo-3,3'-dimethoxybiphenyl dyes with the exception of those mentioned elsewhere in this Annex incomplete

This compound group is populated by taking the more general compound group and subtracting the chemicals found in the relevent Annex.

37 14
o-Dianisidine-based dyes incomplete This compound group has not yet been assigned a structural definition. other 38 7
O-PHENYLENEDIAMINE SALTS in progress

This compound group is defined by the SMILES string '[CH]1=[CH][CH]=[C]([C](=[CH]1)[ND1])[ND1]'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system.

structure 2 5
o-Tolidine-based dyes incomplete This compound group has not yet been assigned a structural definition. other 1 8
Octabromobiphenyls (OctaBBs) complete 09/05/25 12 51
Octabromodiphenylethers (OctaBDEs) complete 09/05/25 fixed list 12 41
Octamethylcyclotetrasiloxane (D4); Decamethylcyclopentasiloxane (D5); dodecamethylcyclohexasiloxane (D6) incomplete

ECHA chemical group parent

4 4
Octamoxin and its salts incomplete This compound group has not yet been assigned a structural definition. structure 1 1
Octamylamine and its salts incomplete This compound group has not yet been assigned a structural definition. structure 1 1
Octodrine and its salts incomplete This compound group has not yet been assigned a structural definition. structure 2 1
Octylphenol ethoxylates incomplete This compound group is defined by the SMILES string 'CC(C)(C)CC(C)(C)C1=CC=C(C=C1)OCCO'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system. other 91 16
Octylphenol ethoxylates and related compounds incomplete This compound group has not yet been assigned a structural definition. other 125 7
Octylphenols incomplete This compound group has not yet been assigned a structural definition. other 30 11
Octyltin compounds in progress

This compound group is populated by its subgroups.

other 138 20
Organic compounds of mercury with the exception of those specified elsewhere in Annex VI of Regulation (EC) No 1272/2008 incomplete

This compound group is populated by taking the more general compound group and subtracting the chemicals found in the relevent Annex.

other 776 57
Organohalogen Flame Retardants - NAS OFR expanded set complete 02/12/24

This compound group is populated from "A Class Approach to Hazard Assessment of Organohalogen Flame Retardants" by National Academies of Sciences, Engineering, and Medicine. The committee identified a set of 1073 analogue compounds as "expanded set" based on combined functional, structural, and predicted bioactivity information.

The subclasses from the seed list used to expand this list are also in Pharos:

fixed list 1084 3
Organophosphate Ester Flame Retardants (OPE FR)

This compound group is populated from combined lists of organophosphorous flame retardants and only includes those that are organophosphate esters. This list is affiliated with Cradle to Cradle Certified® and Green Science Policy Institute.

229 8
Organophosphate Pesticides, NOS 0 1
ORGANOPHOSPHOROUS COMPOUNDS complete 09/13/18

This compound group is defined by the SMILES string 'POC'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system.

structure 3176 1
Organophosphorous flame retardants (OPFRs) incomplete

This compound group is populated from lists of organophosphorous / organophosphate flame retardants from multiple commercial and academic sources.

functional use 282 7
Organophosphorous Pesticides, metabolites, and other targets for measurement - Biomonitoring CA complete 12/03/24

This compound group contains designated chemicals identified by Biomonitoring California that are organophosphorous pesticides, metabolites of organophosphorous pesticides, and other targets for measurement in biomonitoring studies.  Designated chemicals are are the list of chemicals from which Biomonitoring California's Scientific Guidance Panel recommends priority chemicals for biomonitoring. The most current list of designated chemicals may be found at https://www.biomonitoring.ca.gov/chemicals/designated-chemicals.

 

other 50 1
ORGANOTIN COMPOUNDS in progress This compound group is defined by the SMILES string 'C[Sn]'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system. element 904 19
Organotin Compounds (OSPAR group) incomplete

The group of organic tin compounds identified by OSPAR for priority action comprises mono-, di-, tri and tetrabutyl and triphenyl tin compounds. https://www.ospar.org/documents?v=7271

other 220 20
ortho-Phthalates - Biomonitoring CA incomplete

This group is populated from the list at https://biomonitoring.ca.gov/chemicals

fixed list 54 1
Orthoboric acid, sodium salt (group) complete 02/27/23

ECHA chemical group parent

6 5
Other banned dyestuffs - OEKO-TEX complete fixed list 8 0
Other chemical residues - OEKO-TEX complete fixed list 30 0
Other chemical residues under observation - OEKO-TEX complete fixed list 3 0
Other PFAA precursors and related compounds - perfluoroalkyl ones incomplete

This group was populated from the OECD's Comprehensive Global Database of Per- and Polyfluoroalkyl Substances (PFASs) at http://www.oecd.org/chemicalsafety/portal-perfluorinated-chemicals/.

315 23
Other PFAA precursors or related compounds - semifluorinated incomplete

This group was populated from the OECD's Comprehensive Global Database of Per- and Polyfluoroalkyl Substances (PFASs) at http://www.oecd.org/chemicalsafety/portal-perfluorinated-chemicals/.

748 23
Other VOCs (volatile organic compounds) and glycols - OEKO-TEX complete fixed list 28 0
Oxanamide and its derivatives incomplete This compound group has not yet been assigned a structural definition. structure 1 1
Oxazolidine formaldehyde releasers in progress 06/03/20

This compound group was populated by a manual search.

functional use 4 0
Oxpheneridine and its salts incomplete This compound group has not yet been assigned a structural definition. structure 1 1
Ozone Depleting Chemicals - Apple RSS complete

This compound group is populated from Apple's Regulated Substances Specification

fixed list 84 0
Ozone Depleting Chemicals (ODCs) in Google's MRSL complete 02/12/21

This compound group was populated from the Google Manufacturing Restricted Substances Specification (v1.0) (TTD_3549)

fixed list 209 2
Ozone Depleting Chemicals, Hydrochlorofluorocarbons - Apple RSL complete

This compound group is populated from Apple's Regulated Substances Specification

fixed list 198 1
p-Phenylenediamine and its salts incomplete This compound group has not yet been assigned a structural definition. structure 2 2
p,p´-Bisphenols - Biomonitoring CA incomplete

This group is populated from the list at https://biomonitoring.ca.gov/chemicals

fixed list 0 3
Palygorskite fibers (> 5µm in length) incomplete

This compound group has not yet been assigned a structural definition.

other 3 3
Parabens incomplete This compound group has not yet been assigned a structural definition. other 11 4
Paraffin oils (petroleum) incomplete This compound group has not yet been assigned a structural definition. other 16 0
Paraffin waxes (coal) incomplete This compound group has not yet been assigned a structural definition. other 5 0