Reaction catalyzed by penicillin amidase (3.5.1.11)

		+		H2O	=			+
	cephalothin	+		H2O	=		(6R,7R)-3-[(acetyloxy)methyl]-7-amino-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid	+		(thiophen-2-yl)acetic acid