Pr. Pokkuluri et J. Trotter, DIMETHYL -DIHYDRO-9,10-ETHENOANTHRACENE-11,12-DICARBOXYLATE, Acta crystallographica. Section C, Crystal structure communications, 50, 1994, pp. 276-278
The molecule of C26H25NO7 has normal dimensions, with the carboxymethy
l group that is remote from the 9-substituent conjugated with the C11=
C12 double bond and the adjacent carboxymethyl group out of conjugatio
n. Molecules are linked by N-H...O hydrogen bonds.