Reaction catalyzed by chondroitin 4-sulfotransferase (2.8.2.5)

		+			=			+		mixture of 4\'-monosulfated oligosaccharides
	3'-phosphoadenylylsulfate	+		chondroitin-derived oligosaccharides	=		adenosine 3',5'-bisphosphate	+		mixture of 4'-monosulfated oligosaccharides