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Four new resin glycosides with macrolactone structures (jalapins), namely, calyhedins VII ( 1 )–X ( 4 ), were isolated from the rhizomes of  Calystegia hederacea  Wall. (Convolvulaceae). The structures of  1 – 4  were determined based on spectroscopic data. They were classified into three ring types: a 27-membered ring ( 1 ), a 22-membered ring ( 2 ,  3 ), and a 23-membered ring ( 4 ). Their sugar moieties were partially acylated using five organic acids, including ( E )-2-methylbut-2-enoic acid, 2 S -methylbutyric acid, and 2  R -methyl-3 R -hydroxybutyric acid. Compound  4  was the first genuine resin glycoside with calyhedic acid F as the glycosidic acid component. Additionally, the cytotoxic activities of  1 ,  2 , and  4  towards HL-60 human promyelocytic leukaemia cells were evaluated. All compounds demonstrated almost the same activity as the positive control, cisplatin.

Four new resin glycosides, calyhedins VII–X, from the rhizomes of Calystegia hederacea