From Amanita muscaria (L.) Fr., Agaricaceae: Eugster et al., Tetrahedron Lett. 1965, 1813. Structure: Fritz et al., ibid. 1965, 2075; Reiner, Eugster, Helv. Chim. Acta 50, 128 (1967). Synthesis: G"oth et al., ibid. 137.