J Pharm Sci. 1977 Jun; 66(6): 889-90.

Cytotoxic agents from Bursera klugii (Burseraceae) I: isolation of sapelins A and B.

Jolad SD, Wiedhopf RM, Cole JR.

A crude chloroform-soluble fraction of the ethanol extract of the leaves of Bursera klugii showed activity against two test systems, the P-388 lymphocytic leukemia (3PS) and the human epidermoid carcinoma of the nasopharynx (9KB). The PS activity was due to two constituents, sapelins A and B.