56748-54-0

(6R,7R)-7-({[2-(AMINOMETHYL)PHENYL]ACETYL}AMINO)-8-OXO-3-[(TETRAZOLO[1,5-B]PYRIDAZIN-6-YLSULFANYL)METHYL]-5-THIA-1-AZABICYCLO[4.2.0]OCT-2-ENE-2-CARBOXYLIC ACID