The structures of ethyl 1,4,5-exo-trimethyl-7-oxo-2,3-diphenylbicyclo[2.2.1]hept-2-ene-5-endo-carboxylate (A) and ethyl 1,4-dimethyl-7-oxo-2,3-diphenylbicyclo[2.2.1]hept-2-ene-5-endo-carboxylate (B)
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