. 2014 Jun 26;2:e461. doi: 10.7717/peerj.461

Table 1. Predominant structures and nomenclature of chemically modified heparins.

The letter I stands for iduronate, and A stands for the amino sugar glucosamine.

Analogue	Predominant repeat	IdoA-2	GlcN-6	GlcN-2	IdoA-3	GlcN-3^*
1(heparin)	I_2SA_NS^6S	SO₃⁻	SO₃⁻	SO₃⁻	OH	OH
2	I_2SA_NAc^6S	SO₃⁻	SO₃⁻	COCH₃	OH	OH
3	I_2OHA_NS^6S	OH	SO₃⁻	SO₃⁻	OH	OH
4	I_2SA_NS^6OH	SO₃⁻	OH	SO₃⁻	OH	OH
5	I_2OHA_NAc^6S	OH	SO₃⁻	COCH₃	OH	OH
6	I_2SA_NAc^6OH	SO₃⁻	OH	COCH₃	OH	OH
7	I_2OHA_NS^6OH	OH	OH	SO₃⁻	OH	OH
8	I_2OHA_NAc^6OH	OH	OH	COCH₃	OH	OH
9	I_2S,3SA_3S,NS^6S	SO₃⁻	SO₃⁻	SO₃⁻	SO₃⁻	SO₃⁻

Notes.

Numbers refer to the ring position of the carbon atoms.