Reaction catalyzed by N-acetylgalactosamine 4-sulfate 6-O-sulfotransferase (2.8.2.33)

		+			=			+
	3'-phosphoadenylyl sulfate	+		chondroitin sulfate A	=		adenosine 3',5'-bisphosphate	+		chondroitin sulfate A 6'-sulfate