(E)-3,3,6,6-Tetra-methyl-9-(2-nitro-styr-yl)-3,4,5,6,7,9-hexa-hydro-1H-xanthene-1,8(2H)-dione.

In the title compound, C(25)H(27)NO(5), each of the cyclo-hexenone rings adopts a half-chair conformation, whereas the six-membered pyran ring adopts a flattened boat conformation, with the O and methine C atoms deviating from the plane of the other four atoms. In the crystal, weak C-H⋯O hydrogen bonds link mol-ecules into chains parallel to the c axis.