Dear Charmm force-field developers,

I have not been able to find parameters for sulphur in the following covalent bond:
Code:
   H  H    O   H  H
| | || | |
..-C- C - S - C -C-...
| | || | |
H H O H H


I am looking specifically for electric charge, bond, angle and torsions force constants (and possibly a variant vdw radius).

Thank you.