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 c9ad2e8a-05d1-4fde-9d98-460e1ab4dcf1-56

This code system http://hl7.org/fhir/comparison/CodeSystem/c9ad2e8a-05d1-4fde-9d98-460e1ab4dcf1-56 defines codes, but no codes are represented here

Code