. 2016 Mar 30;6(3):150275. doi: 10.1098/rsob.150275

Table 1.

Nomenclature and structures of chemically modified heparin structures. I stands for iduronate, and A stands for the amino sugar glucosamine. ^aNumbers refer to the ring position of carbon atoms. The average number of sulfate groups per disaccharide is also indicated.

analogue	predominant repeat	IdoUA-2	GlcN-6	GlcN-2	IdoUA-3	GlcN-3^a	sulfate groups per disaccharide
D1 (heparin)	I_2SA^6SNs	SO₃⁻	SO₃⁻	SO₃⁻	OH	OH	2.4
D2	I_2SA^6SNAc	SO₃⁻	SO₃⁻	COCH₃	OH	OH	1.8
D3	I_2OHA^6SNs	OH	SO₃⁻	SO₃⁻	OH	OH	1.9
D4	I_2SA^6SNs	SO₃⁻	OH	SO₃⁻	OH	OH	1.8
D5	I_2OHA^6SNAc	OH	SO₃⁻	COCH₃	OH	OH	1.2
D6	I_2SA^6OHNAc	SO₃⁻	OH	COCH₃	OH	OH	0.8
D7	I_2OHA^6OHNs	OH	OH	SO₃⁻	OH	OH	0.8
D8	I_2OHA^6OHNAc	OH	OH	COCH₃	OH	OH	0
D9	I_2S,3SA^6S_3SNs	SO₃⁻	SO₃⁻	SO₃⁻	SO₃⁻	SO₃⁻	4.4