Stemofoline ethyl acetate solvate

R factor = 0.032; wR factor = 0.119; data-to-parameter ratio = 10.4. Crystals of the title compound, C22H29NO5C4H8O2, {[systematic name: (2R,3R,5R,5aS,6R,8aR,9S)-(5Z)-5-[3-butyl-tetrahydro-6-methyl-2,5-methano-4,3,8a-[1]propanyl[3]yl-idenefuro[3,2-f][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 O atoms, perhaps indicating weak interactions which could influence the packing of species within the unit cell. Related literature For the single-crystal X-ray structure and absolute config-uration of stemofoline as the hydrobromide monohydrate, see: Irie et al. (1970). For two stemofoline alkaloids with structural modifications in the butyl side chain, see: Seger et al. (2004). For the isolation of stemofoline from the root extracts o