Union of http://terminology.hl7.org/CodeSystem/CAS and http://terminology.hl7.org/CodeSystem/CAS

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

CodeSystem

Generated Narrative: CodeSystem a5f384d8-a316-4736-ae90-ae021409e6cf-56

This code system http://hl7.org/fhir/comparison/CodeSystem/a5f384d8-a316-4736-ae90-ae021409e6cf-56 defines codes, but no codes are represented here

Code