Crystalline (6R, 7R) -7- {2- (5-amino- 1,2,4 thiadiazol-3-yl) -2-(Z) -trityloxyimino -acetylamino} -3- (R) -1′-tert-butoxycarbonyl-2-oxo- 1,3 ′ bipyrrolidinyl- (3E) -ylidenemethyl -8-oxo-5-thia-1-aza-bicyclo 4.2. 0 oct-2-ene-2-carboxylic acid benzhydryl ester; its preparation and use

摘要

A solid DMSO solvate of a compound of formula (I) is described, which is a useful intermediate for preparing the broad spectrum antibiotics Ceftobiprole and Ceftobiprole Medocaril.