pivaloyloxymethyl-7-(Z)-2-[2-(tert-butoxycarbonylamino)thiazol-4-yl]pent-2-enamido-3-(carbamoyloxymethyl)-3-cephem-4-carboxylat
pivaloyloxymethyl 7-(Z)-2-[2-(tert-butoxycarbonylamino)thiazol-4-yl]pent-2-enamido-3-(carbamoyloxymethyl)-3-cephem-4-carboxylate