Jolad S D, Wiedhopf R M, Cole J R
J Pharm Sci. 1977 Jun;66(6):889-90. doi: 10.1002/jps.2600660645.
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.
