α-L-IdopA2S-(1→?)-β-D-GalpNAc4S-(1→?)-β-D-GlcpA-(1→?)-β-D-GalpNAc6S-(1→?)-?-?-GlcpA-(1→?)-β-D-GalpNAc6S-(1→?)-?-L-IdopA-(1→
