The new alkaloid (-)-turkiyenine [1] has been obtained from Chelidonium majus. It is enantiomeric with the previously known (+)-turkiyenine found in Hypericum procumbens. The unusual alkaloid (+)-turkiyenine [1] was found in Hypecoum procumbens L. (Papaveraceae) (1). At a later date, (+)-oxoturkiyenine [2] was obtained from Hypecoum pendulum (2). Presently, as a result of a study of Turkish Chelidonium majus L. (Papaveraceae), an annual plant well investigated in the past (3), we have isolated and characterized the new alkaloid (-)-turkiyenine [1], C₁₉H₁₉NO₆, enantiomeric with the H. procumbens base. (-)-Turkiyenine exhibits [α] -76° (c = 0.11, MeOH) and [α] -99° (c = 0.12, CHCl₃). The uv, ir, ms, and ¹H-nmr spectra of (-)-turkiyenine correspond to those previously reported for (+)-turkiyenine. Additionally, the two enantiomers display corresponding tlc Rf values in different solvent systems. The isolation of (-)-turkiyenine from C. majus suggests that turkiyenine-type alkaloids may be more common among plants belonging to the Papaveraceae family than previously thought. It should be noted that the absolute configurations for the turkiyenines still remain to be established. Other alkaloids we have found in C. majus are the known protopine, (-)-stylopine, (+)-chelidonine, (+)-8-methoxydihydrosanguinarine, chelidimerine, (+)-homochelidonine, (±)-8-acetonyldihydrosanguinarine, dihydrosanguinarine, oxysanguinarine, angoline, dihydrochelerythrine, norsanguinarine, and (+)-8-acetonyldihydrochelerythrine. These were identified by comparison with authentic samples and/or by spectral comparisons and specific rotations.