label: alpha-L-IdoA-(1->3)-beta-D-GalNAc-4-sulfate-(1->4)-alpha-L-IdoA-(1->3)-D-GalNAc-4-sulfate + N-acetyl-D-galactosamine => beta-D-GalNAc-(1->4)-alpha-L-IdoA-(1->3)-beta-D-GalNAc-4-sulfate-(1->4)-alpha-L-IdoA-(1->3)-D-GalNAc-4-sulfate + H2O
label_lc: alpha-l-idoa-(1->3)-beta-d-galnac-4-sulfate-(1->4)-alpha-l-idoa-(1->3)-d-galnac-4-sulfate + n-acetyl-d-galactosamine => beta-d-galnac-(1->4)-alpha-l-idoa-(1->3)-beta-d-galnac-4-sulfate-(1->4)-alpha-l-idoa-(1->3)-d-galnac-4-sulfate + h2o