Reaction catalyzed by sphingomyelin phosphodiesterase (3.1.4.12)

		+		H2O	=			+
	N-dodecanoyl-4-nitrobenz-2-oxa-1,3-diazole-sphingomyelin	+		H2O	=		4-nitrobenz-2-oxa-1,3-diazole-N-dodecanoylsphingosine	+		choline phosphate