(6R,7R)-3-[(Z)-3-(tert-Butyl-dimethyl-silanyloxy)-propenyl]-8-oxo-7-{2-[2-(trityl-amino)-thiazol-4-yl]-2-[(Z)-trityloxyimino]-acetylamino}-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid 4-methoxy-benzyl ester
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