(6R,7R)-7-Amino-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid diphenylmethyl ester

This compound is a key intermediate in the synthesis of β-lactam antibiotics. It provides the core structure necessary for the development of various cephalosporin and penicillin-based antibiotics.