Glycam2000b is an modification of Glycam2000a based on the change
of the OH vdw parameters.  Changes were based on better reproduction 
of crystalline and sol'n phase properties of mono- and disaccharides.

Glycam2000a
  OH       1.9610     0.1400
changed to 
Glycam2000b
  OH       1.7210     0.2104

This is the preferred Glycam2000 parameter set as of 11-2005

When using this work please cite the following:
Karl N. Kirschner and Robert J. Woods
Solvent interactions determine carbohydrate conformation.
PNAS, 2001 98 (19) 10541-10545.

N.B.  Correct rotational behavior for O-C-C-O fragments requires SCEE=SCNB=1.0.  This is
in contrast to "standard" AMBER, in which it is normal to set SCEE=1.2 and SCNB=2.0.  Unless
you are attempting to generate rotamer populations, it is OK to use the "standard" values.
Using non-standard values (SCEE=SCNB=1.0) may be unacceptable when a protein is also present.

GLYCAM contributors include:
Karl N. Kirschner 
Laura C. Morris
Sompathana Sundara