I recently defined alcohol topologies using existing Glycerylphosphorylcholine topology. While running MD with GBSW solvation, I noticed alcohols forming hydrogen bonds with themselves. For eg: In Glycerol (CH2-OH -- CH-OH -- CH2-OH), the first -OH hydrogen bonds with oxygen of second -OH. Is this possible with explicit solvation ? Have anyone else noticed this kind of hydrogen bonding ? I used a distance cutoff of 2.4 A for defining hydrogen bonds.