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The pyridine ring in the title compound, C(39)H(47)NO(7)·0.5C(2)H(5)OH·0.5 H(2)O, is connected to one 3,3,6,6-tetra-methyl-1,8-dioxoxanthenyl and one 4a-hy-droxy-3,3,6,6-tetra-methyl-1,8-dioxodeca-hydroxanthenyl substituent in the 2- and 6-positions of the ring. In the former substituent, the six-membered xanthenyl ring adopts a flattened envelope conformation (with the methine C atom as the flap) while in the latter, the six-membered xanthenyl ring adopts a twisted envelope conformation (with the C atom bearing the hy-droxy group representing the flap). The hy-droxy H atom forms an intra-molecular hydrogen bond to the pyridyl N atom. An ethanol solvent mol-ecule is disordered with respect to a water mol-ecule in a 1:1 ratio. The water mol-ecule itself is disordered over two positions of equal occupancy.

acta crystallographica. section e

4a-Hydroxy-3,3,6,6-tetramethyl-9-[6-(3,3,6,6-tetramethyl-1,8-dioxo-2,3,4,5,6,7,8,9-octahydro-1<i>H</i>-xanthen-9-yl)pyridin-2-yl]-2,3,4,4a,5,6,7,8,9,9a-decahydro-1<i>H</i>-xanthene-1,8-dione ethanol hemisolvate hemihydrate

4a-Hydroxy-3,3,6,6-tetramethyl-9-[6-(3,3,6,6-tetramethyl-1,8-dioxo-2,3,4,5,6,7,8,9-octahydro-1H-xanthen-9-yl)pyridin-2-yl]-2,3,4,4a,5,6,7,8,9,9a-decahydro-1H-xanthene-1,8-dione ethanol hemisolvate hemihydrate