Generated Narrative: ValueSet v3-EntityClassChemicalSubstance Language: en Include codes fromhttp://terminology.hl7.org/CodeSystem/v3-EntityClass version ?3.0.0 where concept is-a CHEM
A substance that is fully defined by an organic or inorganic chemical formula, includes mixtures of other chemical substances. Refine using, e.g., IUPAC codes.
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