?-L-IdopA2S-(1->?)-?-D-GalpNAc4S-(1->?)-?-D-GlcpA-(1->?)-?-D-GalpNAc6S-(1->?)-?-?-GlcpA-(1->?)-?-D-GalpNAc6S-(1->?)-?-L-Ido?A-(1->
