This molecule features a five-membered lactone ring fused to a benzene ring (an isobenzofuranone-type structure), with two carbons shared by the two rings; the benzene ring is unsubstituted. In the lactone ring, the oxygen is not adjacent to the shared carbons but is positioned at the beta site relative to them. One of the carbons adjacent to this oxygen is double-bonded to an oxygen, forming a carbonyl (C=O) group, while the other adjacent carbon (located on the opposite side) is a chiral center (R configuration) that bears two substituents:
- One substituent is an unsubstituted phenyl ring.
- A second substituent is a para-chlorophenyl ring (the chlorine is opposite the attachment point).