This is the ValueSet that contains all the codes in ICD-11 Substances Value Set (https://fhir.dghs.gov.bd/core/ValueSet/icd11-substances-valueset) and ICD-11 Substances Value Set (https://fhir.dghs.gov.bd/core/ValueSet/icd11-substances-valueset). E.g. what you have to deal with if you get resources containing codes in either of them