The molecule is built around a quaternary (tert-butyl) carbon. This carbon is bonded to:
- three equivalent methyl groups (-CH3), and
- a fourth substituent described below.

Describe the fourth substituent in detail:
1. The substituent starts with a carbon attached to the tert-butyl center, and it bears a negatively charged alkoxide oxygen and is double-bonded to a nitrogen atom.
2. The nitrogen is single-bonded to a sulfonyl sulfur.
3. The sulfur is doubly bonded to two oxygen atoms.
4. The sulfur's remaining valence is attached to a phenyl ring.
5. On this phenyl ring, there is a single methyl group positioned para to the sulfur-bearing carbon.