From bark of Phillyrea latifolia L., and allied Oleaceae: Campona, Ann. 24, 242 (1837); Eijkman, Rec. Trav. Chim. 5, 127 (1886); Kramer, Compt. Rend. 196, 814 (1933); Sosa, Bull. Soc. Chim. Biol. 29, 918 (1947). Structure: Kaku et al., J. Pharm. Soc. Jpn. 59, 248 (1939); M. Chiba et al., Chem. Pharm. Bull. 25, 3435 (1977).