This code system http://terminology.hl7.org/CodeSystem/W1-W2 defines codes, but no codes are represented here

 <status value="retired"/> <experimental value="false"/> <date value="2021-11-09T10:00:00+10:00"/> <publisher value="TBD - External Body"/> <description value="WHO rec\# drug codes"/> <caseSensitive value="true"/> <content value="not-present"/> </CodeSystem>