label: chondroitin 4'-sulfate + n 3'-phosphoadenylyl sulfate <=> chondroitin 4',6'-bissulfate + n adenosine 3',5'-bisphosphate + n H(+)
label_lc: chondroitin 4'-sulfate + n 3'-phosphoadenylyl sulfate <=> chondroitin 4',6'-bissulfate + n adenosine 3',5'-bisphosphate + n h(+)