rac-Ethyl 2-hydroxy-2,7,7-trimethyl-4-(4-nitrophenyl)-5-oxo-3,4,5,6,7,8-hexahydro-2H-chromene-3-carboxylate
The title molecule, C21H25NO7, has four stereogenic centres and crystallized as a racemate.It consists of enantiomeric pairs with the relative configuration rac-(1R*,2S*,3R*).The cyclohexenone ring adopts an envelope conformation; the dimethyl-substituted C atom lies 0.640 (1) Å out of the mean plane formed by Vase the rest of the