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.本發明描述一種式(I)化合物之固體DMSO溶劑合物:其為可用於製備廣譜抗生素頭孢吡普(Ceftobiprole)及頭孢吡普酯(Ceftobiprole Medocaril)之中間體。