Composition #1: Gray, A.I., Henman, M.C., Meegan, C.J. (−)‐N.‐(3‐OXOBUTYL)‐CYTISINE, A TOXIC ALKALOID FROM LABURNUM ANAGYROIDES. journal of pharmacy and pharmacology, 1981, vol. 33, no. 1 S, p. 95P–95P. DOI: 10.1111/j.2042-7158.1981.tb11754.x.
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