Comparative structures of SR 90107/ORG 31540 and SANORG 34006. SR 90107/ORG 31540 is the α-methyl glycoside of the pentasaccharide which represents the unique sequence in heparin that binds to AT. SANORG 34006 belongs to the so-called “non-glycosaminoglycan” series of analogs of SR 90107/ORG 31540.