TABLE 2.

Chemically modified heparin structures

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

Analogue	Predominant structure	IdoC2	GlcC6	GlcC2
Heparin	I2SA6SNS	SO3−	SO3−	SO3−
De-N-sulfated	I2SA6SNAc	SO3−	SO3−	COCH3
De-2-O-sulfated	I2OHA6SNS	OH	SO3−	SO3−
De-6-O-sulfated	I2SA6OHNS	SO3	OH	SO3
De-N/de-2-O-sulfated	I2OHA6SNAc	OH	SO3−	COCH3
De-N/de-6-O-sulfated	I2SA6OHNAc	SO3−	OH	COCH3
Only N-sulfated	I2OHA6OHNS	OH	OH	SO3−
Fully de-N/O-sulfated	I2OHA6OHNAc	OH	OH	COCH3