A. Pajunen et M. Kokko, 1,5-diphenylbicyclo[2.2.1]hept-5-ene-endo-2,endo-3-dicarboxylic anhydride and 1,5-diphenylbicyclo[2.2.1]hept-5-ene-exo-2,exo-3-dicarboxylic anhydride, ACT CRYST C, 54, 1998, pp. 1724-1727
The change of the anhydride group with respect to the cyclopentene ring in
the endo and exo isomers of C21H16O3 is reflected in the conformation of th
e phenyl rings and in the torsion angles around the C1-C10 bond.