Union of http://terminology.hl7.org/ValueSet/v3-EntityClassChemicalSubstance and http://terminology.hl7.org/ValueSet/v3-EntityClassChemicalSubstance

This is the ValueSet that contains all the codes in EntityClassChemicalSubstance (http://terminology.hl7.org/ValueSet/v3-EntityClassChemicalSubstance) and EntityClassChemicalSubstance (http://terminology.hl7.org/ValueSet/v3-EntityClassChemicalSubstance). E.g. what you have to deal with if you get resources containing codes in either of them

CodeSystem

Generated Narrative: ValueSet 5b1132b8-51e9-46ac-8efa-9d1c907d9515-7535