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  1. NDDF Source Information 
    https://www.nlm.nih.gov/.../umls/rxnorm/sourcereleasedocs/nddf.html
    ... CDA, CDC and CDD atoms File: RGCNSEQ4_GCNSEQNO_MSTR Clinical Formulation ID Table Provides attributes of a ... Ingredient Status Code N/A File: RHICLSQ1_HICLSEQNO_MSTR Ingredient List Identifier Description Table v1 Relates the ...