CHARMM Development Project Forums User Discussion & Questions Parameter Set Discussion Parameters for C- (SO2) - C

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.