The molecule is an amide formed between 6-aminopenicillin and butylamine. It is a monocarboxylic acid amide and a thiazolidinemonocarboxylic acid. It derives from a 6-aminopenicillanic acid.
(2R,4S)-2-[(1R)-1-amino-2-(butylamino)-2-oxoethyl]-5,5-dimethyl-1,3-thiazolidine-4-carboxylic acid