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Two new C21 steroids, 12β-O-acetyl-20-O-(2-methylbutyryl)-sarcostin and its 3-O-digitoxopyranoside (1-2) were isolated from the roots of Cynanchum otophyllum, together with three known steroids, namely deacetylmetaplexigenin (3), sarcostin (4), and kidjoranin 3-O-β-D-digitoxopyranoside (5). The structures of the new steroids were established by spectroscopic and chemical methods, especially two-dimensional NMR techniques. [ABSTRACT FROM AUTHOR]

Two new polyhydroxypregnane glycosides, namely cynotophyllosides I-J, were isolated from the roots of Cynanchum otophyllum, together with three known steroids, namely deacetylmetaplexigenin, sarcostin and hemoside. Their structures were established by extensive spectroscopic methods especially 2D NMR techniques) and acidcatalysed hydrolysis. [ABSTRACT FROM AUTHOR]

The article presents chemical formulae related to polyhydroxypregnane glycosides obtained from the roots of Cynanchum otophyllum, a medicinal plant belonging to the family Apocynaceae, published in the journal "Journal of Chemical Research" in 2013.