This code system http://hl7.org/fhir/substance-representation-type defines the following codes:

Code Display
Systematic systematic
Scientific scientific
Brand brand
<status value="active"/> <experimental value="false"/> <date value="2021-01-05T10:01:24+11:00"/> <publisher value="HL7 (FHIR Project)"/> <contact> <telecom> <system value="url"/> <value value="http://hl7.org/fhir"/> </telecom> <telecom> <system value="email"/> <value value="fhir@lists.hl7.org"/> </telecom> </contact> <description value="SubstanceRepresentationType"/> <jurisdiction> <coding> <system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/> <code value="001"/> <display value="World"/> </coding> </jurisdiction> <caseSensitive value="true"/> <valueSet value="http://hl7.org/fhir/ValueSet/substance-representation-type"/> <content value="complete"/> <concept> <code value="Systematic"/> <display value="systematic"/> </concept> <concept> <code value="Scientific"/> <display value="scientific"/> </concept> <concept> <code value="Brand"/> <display value="brand"/> </concept> </CodeSystem>