isocucurbitacin B

Isocucurbitacin B is a potent cytotoxic compound isolated from Helicteres rswa L. (Sterculiaceae). Isocucurbitacin B possesses anti-tumor acticity[1][2].

[1] MF Bean, et al. Cucurbitacin B and isocucurbitacin B: cytotoxic components of Helicteres isora. Journal of Natural Products. 1985.
[2] SM Kupchan, et al. Tumor Inhibitors. XXIII.1 The Cytotoxic Principles of Marah oreganus.H. Cytotoxic principles of Marah oreganus H. 1976.