Abstract
Two new polyoxypregnane derivatives, tomentin (12β-O-, 20-O-diacetyltomentogenin) and dehydrotomentin (12β-O, 20-O-diacetylutendin), were isolated from the stem of Marsdenia tomentosa. Dehydrotomentin is a diester possessing the utendin skeleton to be isolated from the Asclepiadaceae plants for the first time. Very characteristic fragment pattern for tomentogenin derivatives was observed in the mass spectrum of tomentin.
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