MCCE/Topology/TORSION

Torsion parameter

Amber:
 * $$ Etors = ( PK / IDIVF ) * ( 1 + cos( PN * phi - PHASE) ) $$

Syntax: ---|-||||||-|-|-|-|-|-| TORSION CONF ATOM ATOM ATOM ATOM relx Vn/2(kcal)  n_fold   gamma    Vn/2(kcal)  n_fold   gamma