The molecule is an amide formed between benzylpenicillin and butylamine. It is a monocarboxylic acid amide and a thiazolidinemonocarboxylic acid. It derives from a benzylpenicillin.
(2R,4S)-2-[(1R)-2-(butylamino)-2-oxo-1-[(2-phenylacetyl)amino]ethyl]-5,5-dimethyl-1,3-thiazolidine-4-carboxylic acid