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.

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

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

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.

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

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

This compound group is defined by the SMILES string 'C1CC(C(CCC(C(CCC(C1Br)Br)Br)Br)Br)Br'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system.

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

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.

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.

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

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

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/

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.

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

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

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

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

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

This compound group does not have a definition yet.

This compound group is populated by the 5 CASRN listed in the US EPA IRIS review Hydrogen Cyanide and Cyanide Salts (CASRN Various) at https://cfpub.epa.gov/ncea/iris/iris_documents/documents/subst/0060.htm. This IRIS document is reference 5 in the Prop 65 listing at https://oehha.ca.gov/media/downloads/proposition-65/chemicals/032213cnisormadl.pdf

This compound group is defined by the SMILES string '[NH4] subtracting [NH4].C'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system.

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

The following three SMARTS strings would be expected to capture all chloramines but there are unknown errors when searching PubChem

[ND1][ClD1] plus

[ClD1][ND2][ClD1] plus

[ClD1][ND3]([ClD1])[ClD1]

For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system.

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

This compound group was manually populated with inorganic cyanide compounds. It is based on an entry in Korea's GHS.

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

This compound group is defined by the SMILES string '[ZnD0]' subtracting '[ZnD0].C' . For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system.

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

This compound group is populated from the MAK list.

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

This compound group is defined by the SMARTS string "[NX2:2]=[C:1]=[OX1:3]". For more information on SMARTS, see https://en.wikipedia.org/wiki/Smiles_arbitrary_target_specification.

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

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

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

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

One approach would be to use the SMILES string 'C[Pb]' and remove substances containing 'c[Pb]' (lowercase specifies aromatic). There are technical challenges since PubChem doesn't seem to provide an option to distinguish between aromatic and aliphatic carbons. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system.

This Compound Group is populated from a list provided in the National Toxicology Program's 14th Report on Carcinogens at https://ntp.niehs.nih.gov/ntp/roc/content/profiles/lead.pdf.

"Lead compounds may be divided between those compounds that are relatively soluble in water and those that are relatively insoluble in water. Compounds are considered soluble or insoluble based on the following criteria: (1)  If a solubility constant (Ksp) is available, a compound with a value greater than or equal to the Ksp for lead chloride (1 × 10–4) is considered soluble. (2) If a Ksp is not available, a compound is considered soluble if more than 2 g of the compound dissolves in 100 mL of water. (3) If no numeric solubility data are available, the compounds are considered soluble or insoluble according to the general rules of solubility. The major soluble lead compounds are lead acetate, lead acetate trihydrate, lead chloride, lead nitrate, and lead subacetate"

This compound group was populated by a substructure search in PubChem using the SMILES string for PFHS (perfluorohexanesulfonate), replacing terminal CF3 with CF2 to allow for longer chain lengths:

C(C(C(C(F)(F)S(=O)(=O)[O-])(F)F)(F)F)(C(C(F)F)(F)F)(F)F

This compound group was populated by a substructure search in PubChem using the SMILES string for PFOA, but replacing the terminal CF3 with CF2 to allow for longer chains:

C(=O)(C(C(C(C(C(C(C(F)F)(F)F)(F)F)(F)F)(F)F)(F)F)(F)F)O

Esters and ethers were manually removed.

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

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

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

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

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

Substructure searches in PubChem cannot easily distinguish between aliphatic and aromatic carbons. If it could, the compound group would be defined by the SMILES string 'C[Hg]' and subsequently filtered to remove substances containing 'c[Hg]' (lowercase specifies aromatic). For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system.

The list can be derived from the PIC Rotterdam Convention Annex III tables http://www.pic.int/Default.aspx?tabid=1132.

MAK provides the following criteria for the organic mercury compounds it flags as hazardous. The complexity of the criteria make it impractical to conduct a structural search for members. The group may be populated using another approach in the future.

"Organomercury compounds are characterized chemically by the covalent binding of one or two alkyl or aryl groups and covalent or ionic binding of a group such as halide,hydroxide, acetate, nitrate or phosphate to the mercury atom."

https://onlinelibrary.wiley.com/doi/10.1002/3527600418.mb743997orge0015

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

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

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

This compound group is defined by the SMILES string '[As][CH3]'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system.

This group will contain

Monomethylarsonic acid (MMA) C[As](=O)(O)O

Dimethylarsinic acid (DMA) C[As](=O)(C)O

This compound group is defined by the SMILES string '[CH3][NH][NH2]' or the SMARTS string '[CD1][ND2][ND1]'. For more information on SMILES, see https://en.wikipedia.org/wiki/Simplified_molecular-input_line-entry_system.

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