From bark of Drimys winteri Forst., Magnoliaceae: Appel, Dohr, Scientia 25, 137 (1958); C.A. 54, 4663f (1960). Structure and stereochemistry: Appel et al., J. Chem. Soc. 1960, 4685. Synthesis: Wenkert, Strike, J. Am. Chem. Soc. 86, 2044 (1964); Yamagawa, et al., Synthesis 1970, 257; M. Jallali-Naini et al., Tetrahedron Lett. 22, 2995 (1981).