Stemofoline ethyl acetate solvate

Crystals of the title compound, C2zH29NOs,C4HsOz, ([ systematic name: (2R,3R,5R,5aS,6R,8aR,9S)-(5Z)-5-[3-butyltetrah ydro-6-me thyl- 2,5-me thano-4,3 ,8a -[1] propan yl[3]ylidenefuro[ 3,2-j] [1,4]oxazepin-7( 5H)-ylidene ]-4-methoxy-3- methylfuran-2(5H)-one ethyl acetate solvate) were isolated from the root extracts of Stemona aphylla (Stemonaceae). The structure closely resembles those of stemofoline derivatives which have previously been reported. Intermolecular contacts are observed between some C-bonded H atoms and nearby 0 atoms, perhaps indicating weak interactions which could influence the packing of species within the unit cell.