methyl (2R,3S,22S,23S)-7-hydroxy-2,3,22,23-di-isopropylidene-dioxy-6,7-seco-5α-stigmastan-6-oate

(2R,3S,22S,23S)-2,3,22,23,-di-isopropylidenedioxy-B-homo-7-oxa-5α-stigmastan 6-one