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From Senecio tsoongianus, two pairs of enantiomeric isomers, tsoongianolides A (1) and B (2), tsoongianolides C (3) and D (4) were isolated. Their structures were elucidated by 1D and 2D-NMR techniques and X-ray diffractions. The cytotoxicity to KB cell of 1 and 2 is also reported.
From Senecio tsoongianus, two pairs of enantiomeric isomers, tsoongianolides A (1) and B (2), tsoongianolides C (3) and D (4) were isolated. Their structures were elucidated by 1D and 2D-NMR techniques and X-ray diffractions The cytotoxicity to KB cell of 1 and 2 is also reported.