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organic compounds
The title compound, C43H32N2O3, has a cis ring-fusion tricyclic structure, which is formed from a benzene ring, a seven-membered diazepine ring and a 1,3-oxazinone ring. The 1,5-diazepine ring has a slightly distorted boat-like conformation, whereas the 1,3-oxazinone ring adopts a half-chair conformation.