21,24-Epoxycycloartane-3,25-diol

21,24-Epoxycycloartane-3,25-diol (compound 15 or 16) is a cycloartanoid triterpene that can be isolated from the leaves of Lansium domesticum. 21,24-Epoxycycloartane-3,25-diol inhibits skin-tumor promotion[1].

[1] Nishizawa M, et al. Isolation of a new cycloartanoid triterpene from leaves of Lansium domesticum novel skin-tumor promotion inhibitors[J]. Tetrahedron letters, 1989, 30(41): 5615-5618.