[alpha-D-GlcpNAc-(1->4)-[alpha-D-GlcpNAc-(1->4)-alpha-D-GlcpNAc-(1->4)-alpha-D-GlcpA-(1->2)-alpha-D-GlcpA-(1->2)]-alpha-D-GlcpA-(1->2)]-alpha-L-Galp(1->