One tetra-coordinate stereogenic carbon (C*) bonded to four different groups, with the absolute stereochemistry is S.

1. Group 1 - sulfonyl: C* is singly bonded to a sulfur that is doubly bonded to two oxygens (-SO2-).
   - The same sulfur is also singly bonded to a phenyl ring.
   - That ring bears a chlorine atom para to the S-attachment; no other ring substituents.

2. Group 2 - aryl: C* is singly bonded to a second phenyl ring that carries a methoxy group (-OCH3) ortho to the C* attachment; the rest of the ring is unsubstituted.

3. Group 3 - aminomethyl: C* is bonded to a -CH2-NH2 unit (primary amine).

4. Group 4 - hydrogen (implicit).