The chemical PPACK has a designated molecular formula of C21H31ClN6O3 and a molecular weight of 450.968 g/mol. Synonyms may include: D-Phenylalanine-proline-arginine methyl chloride, D-Phe-pro-arg CH2Cl, Phe-pro-arg-methyl chloride, UNII-N62UL02WW4 (ChemID). PPACK has been assigned a MeSH pharmacological action of: Cysteine Proteinase Inhibitor, Serine Proteinase Inhibitor.