N-acetylgalactosamine-4-sulfatase activity https://github.com/geneontology/go-ontology/issues/30193 molecular_function EC:3.1.6.12 Wikipedia:Arylsulfatase_B N-acetylgalactosamine-4-sulphatase activity chondroitinsulfatase Reactome:R-HSA-2282889 N-acetylgalactosamine 4-sulfate sulfohydrolase activity GO:0003943 Reactome:R-HSA-1793207 acetylgalactosamine 4-sulfatase activity Reactome:R-HSA-1606789 N-acetyl-D-galactosamine-4-sulfate 4-sulfohydrolase activity Catalysis of the hydrolysis of the 4-sulfate groups of the N-acetyl-D-galactosamine 4-sulfate units of chondroitin sulfate and dermatan sulfate. MetaCyc:3.1.6.12-RXN arylsulfatase B Reactome:R-HSA-9036065 sulfuric ester hydrolase activity