1. Begin with a six-membered benzene ring (call it Ring A). Number it so that carbon 1 bears the main side chain and carbon 3 bears a fluoro substituent (all other ring positions carry hydrogen).
2. The main side chain is a methylene group (-CH2-) that connects to the nitrogen (N1) of a six-membered lactam ring. This ring is labeled as N1-C2-C3-O4-C5-C6, where C2 is double-bonded to an oxygen forming the carbonyl. C5 and C6 are shared with a benzene ring to form a fused bicyclic system.
3. At C3, an exocyclic double bond connects to a carbon leading to a phenyl ring. This phenyl ring is para-substituted with a methyl ester group (-C(=O)OCH3) and has no other substituents.
