A molecular structure (molecule or part of a molecule) which is the part of the molecule causing the intended pharmacological action. The value set for ActiveMoietySubstanceType may often be a subset of a SubstanceType value set. Candidate value sets are subsets of ChEBI, PubChem CID, CAS Number, InChi Key, and UNII.
Examples:* Metoprolol (without the succinate or tartrate) * Amoxicillin (anhydrous) * Heparin (ion, without the matching Na or K cation)