Starting from a benzene ring. Number its carbon 1 to 6 in a clockwise direction. 

Substituents on Ring A  
- C-1: methoxy group (-O-CH3).  
- C-3: a side-chain described below.  
- C-4: second methoxy group (-O-CH3).  
Carbons 2, 5, 6 bear hydrogen only.

Side-chain at C-3 (Ring A)
1. Carbon C-alpha is directly attached to Ring A and is a S-configured. Its substituents are:
     a) Ring A,  
     b) methyl (-CH3),  
     c) amino group (-NH-),  
     d) hydrogen.
  
2. The amino nitrogen is bonded to a second chiral carbon C-beta (configuration R). The substituents on C-beta:
     a) the amino nitrogen,  
     b) methyl (-CH3),  
     c) phenyl ring B,  
     d) hydrogen.  

Ring B (attached to C-beta). Number its carbons so that C-1 is the point of attachment to C-beta.
- C-3: chlorine atom.    
- C-4: fluorine atom.
All other positions on Ring B carry hydrogen.