The molecule is built around a central sp2 carbon (C-alpha).

C-alpha carries three substituents:  
  1. A hydroxyl group (-OH) by a single bond.  
  2. A double bond to an imino nitrogen (no E/Z configuration defined for this double bond); that nitrogen in turn bears one methyl group.  
  3. A methylene group (-CH2-).

The methylene links C-alpha to position-1 of a first benzene ring (ring A).  
Ring A is 1,4-disubstituted: position-1 is the incoming methylene, and position-4 bears an anilino nitrogen (-NH-).

That anilino nitrogen is bonded to a stereogenic carbon C* that has:  
- one methyl group,  
- one hydrogen,  
- and is directly attached to position-1 of a second benzene ring (ring B).  
The absolute configuration at C* is S (CIP).  

Ring B is 1,3-disubstituted: position-1 is the bond to C*, and position-3 bears a chlorine atom.