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The structure determination of the title compound, rotenone [alpha]-oxime [systematic name: 1,2,12,12a-tetra­hydro-8,9-di­meth­oxy-2-(1-methyl­ethenyl)-[1]­benzo­py­rano­[3,4-b]­furo­[2,3-h][1]benzo­pyran-6(6H)-one oxime], C23H23NO6, confirms that the mol­ecule has an approximately V-shaped structure. One of the rings has a typical cyclo­hexene-like monoplanar conformation and the central ring adopts a 1,2-diplanar conformation.
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