rac-methyl (9R,10R,12S)-12-(2-methoxy-2-oxoethyl)-9,10-dihydro-9,10-ethanoanthracene-12-carboxylate

9',10'-dihydro-5-carbomethoxyspiro<cyclopentane-1,11'-<9,10>ethanoanthracen>-2-one

dimethyl 9,10-dioxo-9,10-dihydroanthracene-2,3-dicarboxylate

1,4-Cyclohexadiene-1,2,4,5-tetracarboxylic acid, tetramethyl ester

rac-methyl (1R,2S,9'S,10'S)-5-oxo-9',10'-dihydrospiro[cyclopentane-1,12'-[9,10]ethanoanthracene]-2-carboxylate