STU Publication of HL7 FHIR® Implementation Guide: Payer Data Exchange (PDex) Drug Formulary, Release 1 STU2 – US Realm
See the specification at http://hl7.org/fhir/us/davinci-drug-formulary/STU2 or learn more at https://www.hl7.org/implement/standards/product_brief.cfm?product_id=517