From mescal buttons, the buds of Lophophora williamsii (Lemaire) Coult. (Anhalonium lewinii Henn.) Cactaceae: Heffter, Ber. 27, 2975 (1894); 29, 221 (1896); Kauder, Arch. Pharm. 237, 190 (1899). Structure and synthesis from 3-acetoxy-4,5-dimethoxy-N-acetylphenethylamine: Spth, Passl, Ber. 65, 1778 (1932); from mescaline: Brossi et al., Helv. Chim. Acta 47, 2089 (1964). Biosynthesis: Kapadia et al., J. Am. Chem. Soc. 92, 6943 (1970).