5-[(2S,4S)-1-(4-Methoxy-benzyloxycarbonyl)-4-tritylsulfanyl-pyrrolidin-2-ylmethyl]-1,1-dioxo-1λ6-[1,2,5]thiadiazolidine-2-carboxylic acid 4-methoxy-benzyl ester

(1R,5S,6S)-2-[(3S,5S)-5-(1,1-dioxo-2-p-methoxybenzyloxycarbonyl-1,2,5-thiadiazolidin-5-yl)methyl-1-p-methoxybenzyloxycarbonylpyrrolidin-3-yl]thio-6-[(1R)-1-hydroxyethyl]-1-methyl-1-carba-2-penem-3-carboxylic acid p-methoxybenzylester