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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
DSL UVCBs-inorganic fixed list 369 0
DSL UVCBs-organic fixed list 1515 0
DSL UVCBs-organic-metal salts fixed list 288 0
DSL UVCBs-organometallic fixed list 252 0
DSL UVCBs-polymer fixed list 317 0
Dyestuffs and pigments classified as carcinogenic - OEKO-TEX complete fixed list 29 0
Dyestuffs classified as allergenic - OEKO-TEX complete fixed list 24 0
Emetine, its salts and derivatives incomplete This compound group has not yet been assigned a structural definition. structure 1 1
Emission of volatiles - OEKO-TEX complete fixed list 10 0
Endocrine Disruptors - Apple RSL complete

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

fixed list 383 1
Endosulfan Isomers complete This compound group was populated from the Stockholm POPs Convention decision http://chm.pops.int/TheConvention/ThePOPs/TheNewPOPs/tabid/2511/Default.aspx fixed list 3 4
Erionite incomplete This compound group has not yet been assigned a structural definition. other 3 0
Eserine and its salts incomplete This compound group has not yet been assigned a structural definition. structure 1 1
esters of 2,4-D incomplete

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

other 0 6
esters of mecoprop and of mecoprop-P incomplete

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

other 0 6
Estrogens, steroidal incomplete

This group has not been assigned a structural definition yet.

1 6
Ethanol, 2,2'-iminobis-, reaction products with epichlorohydrin and 2-nitro-1,4-benzenediamine (HC Blue No. 5) and its salts incomplete This compound group has not yet been assigned a structural definition. structure 2 1
Ethoheptazine and its salts incomplete This compound group has not yet been assigned a structural definition. structure 1 1
Ethylene amines incomplete

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

other 12 1
ETHYLENEBISDITHIOCARBAMIC ACID, SALTS AND ESTERS 7 1
ethylenediammonium O,O-bis(octyl) phosphorodithioate, mixed isomers incomplete

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

other 0 4
Extract oils (coal), coal-tar residual pyrolysis oils, and other distillate fractions, residues incomplete This compound group has not yet been assigned a structural definition. other 10 0
Extract residues (coal), and other fractions and distillation residues incomplete This compound group has not yet been assigned a structural definition. other 15 0
Extracts (petroleum) and realted distillates and unspecified fractions incomplete This compound group has not yet been assigned a structural definition. other 26 0
Fatty acid dialkylamides and dialkanolamides 2 0
Fatty alcohols, saturated, with even-numbered C-chain, number of C-atoms >=16, with terminating OH-group complete 39 0
Flame Retardants incomplete

This compound group is populated by its subgroups and literature searches for flame retardants. Please contact support@pharosproject.net with any suggestions or additions.

functional use 2175 2
Flame Retardants, non-halogenated, non-organophosphorous incomplete

This group includes minerals, amines, and inorganic phosphates

functional use 81 6
Fluoride compounds, Inorganic in progress This compound group is defined by the SMILES string '[F]' and subsequently filtered to remove substances containing '[C]'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system. other 47 2
Fluorides incomplete This compound group has not yet been assigned a structural definition. other 3 1
Fluorinated Organic Compounds incomplete This compound group is defined by the SMILES string 'C[F]'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system. structure 22121 4
fluoroacetates, soluble incomplete

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

other 0 2
Fluoroaceticacid, salts incomplete

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

other 0 2
Fluoropolymers 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/.

269 23
fluorosilicates incomplete

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

other 2 0
fluorosilicates, 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.

1 1
Fluorotelomer-related compounds 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/.

1874 23
Foots oil (petroleum) and other treated and untreated Foots oil incomplete This compound group has not yet been assigned a structural definition. other 6 0
Forbidden flame retardant - OEKO-TEX complete fixed list 110 0
Formaldehyde based binders incomplete This compound group has not yet been assigned a structural definition. functional use 398 5
Formaldehyde compounds and polymers complete 09/11/18

This compound group was populated by searching ChemIDplus for all compounds whose name contained "formaldehyde". Additionally, it contains the compounds in its subgroups. 

other 1164 4
Formaldehyde compounds, Urea formaldehyde based incomplete

This compound group was populated with chemicals in Pharos with both "urea" and "formaldehyde" in the name.

other 164 6
Formaldehyde Donors complete 05/29/20

This compound group is populated from a list of chemicals in an ECHA Investigation Report - Formaldehyde and Formaldehyde Releasers as well as manual searches. Report downloaded from https://echa.europa.eu/documents/10162/13641/annex_xv_report_formaldehyde_en.pdf/58be2f0a-7ca7-264d-a594-da5051a1c74b

149-44-0 (Sodium formaldehyde sulfoxylate) was added based on suggestion by GreenSeal, citing https://pubchem.ncbi.nlm.nih.gov/compound/Sodium-hydroxymethanesulfinate and https://www.fishersci.com/store/msds?partNumber=AC149190250&productDescription=SODIUM+FORMALDEHYDESULFO+25KG&vendorId=VN00032119&countryCode=US&language=en 

functional use 196 4
Formaldehyde releasers - WA DoE in progress 02/11/25

This compound group is compiled from WA DoE for Toxic-Free Cosmetics Act. Members CAS are subject to changes as rulemaking finalizes.

fixed list 170 5
Fuel gases incomplete This compound group has not yet been assigned a structural definition. other 15 1
Fuel oils, high-sulfur, Heavy Fuel oil, (and other residual oils) incomplete This compound group has not yet been assigned a structural definition. other 6 1
FURANS incomplete

This compound group is defined by the SMILES string 'C1=COC=C1'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system.

other 0 2
Gas oils (oil sand) (and hydrotreated) incomplete This compound group has not yet been assigned a structural definition. other 2 0
Gas oils (petroleum), treated fractions incomplete This compound group has not yet been assigned a structural definition. other 15 0
Gases (petroleum), refined, and recovered Refinery gasses incomplete This compound group has not yet been assigned a structural definition. other 88 0
Gasoline (automotive, refined, processed, recovered, and other unspecified fractions) incomplete This compound group has not yet been assigned a structural definition. other 8 1
Germanium Compounds complete 08/09/18

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

element 1206 1
Glutethimide and its salts incomplete This compound group has not yet been assigned a structural definition. structure 1 1
Glycidyl ethers incomplete

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

The SMILES string "COCC1CO1" captures all glycidyl ethers but is not specific enough as the only filter. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system.

other 2 2
GLYCOL ETHERS incomplete This compound group has not yet been assigned a structural definition. other 3479 5
Glycol ethers acetate incomplete This compound group has not yet been assigned a structural definition. other 2 0
Glymes incomplete

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

other 6 0
Glyphosate and salts - OEKO-TEX complete fixed list 4 0
Gold compounds, inorganic in progress This compound group is defined by the SMILES string '[Au]' and subsequently filtered to remove substances containing '[C]'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system. other 0 1
Gold salts complete 04/01/21

This compound group was populated using a substructure search of PubChem using the SMILES string [Au].

element 496 1
Guanethidine and its salts incomplete This compound group has not yet been assigned a structural definition. structure 1 1
Hafnium compounds in progress This compound group is defined by the SMILES string '[Hf]'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system. element 1 0
Halogenated diaryl alkanes incomplete 4 1
Halogenated diphenyl methanes 3 1
Halogenated diphenyl methanes - ECHA in progress 06/23/25

The substances included in the group cover linear and branched aliphatic and aromatic siloxanes as well as cyclic siloxanes. In addition polymeric siloxanes notified under previous legislation (NONS) have been included in the group.

fixed list 34 1
Halogenated Flame Retardants (HFRs) incomplete 05/01/19

This compound group is populated by its subgroups, including a National Academies of Science report "A Class Approach to Hazard Assessment of Organohalogen Flame Retardants (2019)" available at https://www.nap.edu/catalog/25412/a-class-approach-to-hazard-assessment-of-organohalogen-flame-retardants

functional use 805 14
halogenated monomethyldiphenylmethanes - UN Transport of Dangerous Goods complete 04/28/23 3 1
HALOGENATED ORGANIC COMPOUNDS incomplete

This compound group is defined by the SMILES string 'C[F,Cl,Br,I]'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system.

structure 40284 4
Halogenated Solvents complete 08/17/23

This compound group is populated by selecting halogenated solvents (excluding salts) from GSPI's Six Classes of Problematic Chemicals - Some Solvents List.

fixed list 1022 9
Halogenated Solvents - City of Portland, OR complete 05/17/17

Includes chemicals from https://www.portlandoregon.gov/water/article/28482

1-Chlorobutane (CAS 109-69-3) added by suggestion of GreenSeal citing https://pubchem.ncbi.nlm.nih.gov/compound/1-Chlorobutane#section=Use-Classification

functional use 88 9
HALONS GROUP incomplete This compound group has not yet been assigned a structural definition. other 11 0
HBCD ISOMERS (US EPA TRI PBTs) incomplete

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

5 1
HBCDD / HBCD isomers complete

This compound group is defined by the SMILES/SMARTS string "C1CC(C(CCC(C(CCC(C1Br)Br)Br)Br)Br)Br" 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 32 11
Heptabromobiphenyls (HeptaBBs) complete 09/05/25 fixed list 24 51
Heptabromodiphenylethers (HeptaBDEs) complete 09/05/25 fixed list 27 41
Heterocyclic Amines (Selected, US NTP) incomplete

This list is populated from https://ntp.niehs.nih.gov/pubhealth/roc/listings/h/heterocyclic/summary/index.html:

2-Amino-3,4-dimethylimidazo [4,5-f]quinoline (MeIQ) - CASRN 77094-11-2
2-Amino-3,8-dimethylimidazo [4,5-f]quinoxaline (MeIQx) - CASRN 77500-04-0
2-Amino-1-methyl-6- phenylimidazo [4,5-b]pyridine (PhIP) - CASRN 105650-23-5

fixed list 3 0
Hexabromobiphenyls (HexaBBs) complete 09/05/25 fixed list 42 51
Hexabromocyclodecane (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 4 2
Hexabromocyclododecane (HBCDD) complete 02/27/23

Hexabromocyclododecane (HBCDD) and all major diastereoisomers identified

7 21
Hexabromodiphenylethers (HexaBDEs) complete 09/05/25 fixed list 42 41
HEXACHLOROCYCLOHEXANE ISOMERS in progress

This compound group should include additional isomers. We're starting with 1,2,3,4,5,6 hexaclorocyclohexane isomers, which can be represented by the SMILES string C1(C(C(C(C(C1(Cl)[H])(Cl)[H])(Cl)[H])(Cl)[H])(Cl)[H])(Cl)[H]. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system.

structure 6 8
hexachloroplatinates incomplete

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

structure 1 1
hexachloroplatinates 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.

0 9
Hexahydromethylphthalic anhydride (EHCA defined) in progress 03/01/23

ECHA chemical group parent: including cis- and trans- stereo isomeric forms and all possible combinations of the isomers

4 5
Hexahydromethylphthalic anhydride and its isomers incomplete This compound group is defined by the SMILES string 'C1CCC2C(C1)C(=O)OC2=O'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system. This isomer group populated from SIN List 2.1 other 5 0
Hexahydrophthalic anhydride and isomer group incomplete This compound group has not yet been assigned a structural definition. other 3 0
Hexane isomers incomplete This compound group has not yet been assigned a structural definition. other 5 2
Hexane, 1,6-diisocyanato-, homopolymer, reaction products with alpha-fluoro-omega-2-hydroxyethyl-poly(difluoromethylene), C16-20-branched alcohols and 1-octadecanol incomplete This compound group has not yet been assigned a structural definition. other 0 1
Highly Fluorinated Substances incomplete

The chemicals in this list are taken from many sources, including:

  • The Swedish Chemicals Agency (KEMI) Report 7-15 Occurrence and use of highly fluorinated substances and alternatives. https://www.kemi.se/en/global/rapporter/2015/report-7-15-occurrence-and-use-of-highly-fluorinated-substances-and-alternatives.pdf
  • Global Database of Per- and Polyfluoroalkyl Substances (PFASs) at http://www.oecd.org/chemicalsafety/portal-perfluorinated-chemicals/
other 16975 4
highly halogenated, carbon-based materials incomplete other 1178 1
Hydrastinine and its salts incomplete This compound group has not yet been assigned a structural definition. structure 1 1
Hydrazides and their salts, Isoniazid incomplete This compound group has not yet been assigned a structural definition. structure 1 1
Hydrazine salts incomplete

This compound group is defined by the SMILES string '[NH2D3][NH2D3]'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system.

structure 86 21
Hydrazines incomplete

This compound group is populated from its subgroups, which include methylhydrazines, dimethyl hydrazines, and phenylhydrazines https://www.cdc.gov/niosh/topics/cancer/npotocca.html

other 97 4
Hydrobromofluorocarbons incomplete

This compound group was populated from the 2016 GADSL list at http://www.gadsl.org/

other 58 1
Hydrocarbons, treated and distilled, various fractions and residues incomplete This compound group has not yet been assigned a structural definition. other 58 0
HYDROCHLOROFLUOROCARBONS (HCFC) incomplete

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

other 128 4
Hydrofluoric acid, its normal salts, its complexes and hydrofluorides incomplete This compound group has not yet been assigned a structural definition. structure 2 1
Hydrofluorocarbons (HFC), short-chain incomplete This compound group has not yet been assigned a structural definition. other 25 2
Hydrofluorocarbons (HFCs) incomplete

This compound group was populated from the 2016 GADSL list at http://www.gadsl.org/

other 34 1