2,5-二氢-6-羟基-2-甲基-5-氧-3-巯基-1,2,4-三嗪

(6R,7S)-3-(chloromethyl)-7-methoxy-2-(pyrrolidine-1-carbonyl)-5-thia-1-azabicyclo[4.2.0]oct-2-en-8-one 5,5-dioxide

3-(acetoxymethyl)-7α-methoxy-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid

Acetic acid (6R,7S)-7-methoxy-5,5,8-trioxo-2-(pyrrolidine-1-carbonyl)-5λ6-thia-1-aza-bicyclo[4.2.0]oct-2-en-3-ylmethyl ester

t-butyl 3-acetoxymethyl-7α-methoxy-3-cephem-4-carboxylate