Begin with a benzene ring (Ring A) bearing two substituents in a para arrangement:
- One substituent is an oxygen linked to a two-carbon chain; The carbon farthest from the oxygen is part of a carboxylic acid group (-COOH), while the carbon closer to the oxygen carries a methyl substituent.
- The second substituent is a (Z)-configured vinyl group (-CH=CH-) whose terminal carbon is part of a six-membered ring (Ring B).
Ring B comprises two nitrogens and four carbons. Starting at the carbon that is shared by the vinyl group and Ring B (labeled C-1) and proceeding counterclockwise, the atoms are arranged as follows: C-1, C-2, N-3, C-4, N-5, and C-6. Within this ring:
- A double bond exists between N-5 and C-6, with C-6 also bearing a hydroxyl group.
- Both C-2 and C-4 are carbonyl carbons (-C=O),each externally double-bonded to an oxygen atom.
- N-3 is bonded to a bromophenyl group, where the bromine atom is positioned meta relative to the attachment point.