              The chiral volume, V(c), for chiral centers that involve a chiral\
               atom bonded to three non-hydrogen atoms and one hydrogen atom.\
\
               V~c~ = V1 * (V2 X V3)\
\
               V1 = the vector distance from the atom specified by\
                    _chem_comp_chir.atom_id to the first atom in the\
                    CHEM_COMP_CHIR_ATOM list\
               V2 = the vector distance from the atom specified by\
                    _chem_comp_chir.atom_id to the second atom in the\
                    CHEM_COMP_CHIR_ATOM list\
               V3 = the vector distance from the atom specified by\
                    _chem_comp_chir.atom_id to the third atom in the\
                    CHEM_COMP_CHIR_ATOM list\
               *  = the vector dot product\
               X  = the vector cross product