Reaction catalyzed by endo-alpha-N-acetylgalactosaminidase (3.2.1.97)

	2,4-dinitrophenyl-GalNAc-alpha-R	+		H2O	=			+
	2,4-dinitrophenyl-GalNAc-alpha-R	+		H2O	=		2,4-dinitrophenol	+		GalNAc-alpha-R