The molecule is a penicillin compound having a 6beta-(2R)-2-(methylideneamino)-2-phenylacetamido side-group. It is a penicillin and a penicillin allergen. It is a conjugate acid of a metampicillin(1-).
(2S,5R,6R)-3,3-dimethyl-6-[[(2R)-2-(methylideneamino)-2-phenylacetyl]amino]-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid