Alkaloid from root of Dictamnus albus Linn., Skimmia repens Nakai, Aegle marmelos Correa, Zanthoxylum alatum Roxb., Rutaceae: Thoms, Ber. 33, 68 (1923); Asahina et al., ibid. 63, 2045 (1930); Chatterjee, Roy, J. Indian Chem. Soc. 36, 267 (1959); Deb et al., ibid. 39, 493 (1962). Structure: M. F. Brundon, N. J. McCorkindale, Chem. Ind. (London) 1956, 1091. Synthesis: Tuppy, Bohm, Angew. Chem. 68, 388 (1956); M. Sato et al., Chem. Pharm. Bull. 35, 1319 (1987).