Tetrahydrosecodine (IIa) and a dihydrosecodine [most probably (III)] have been isolated from Rhazya stricta and tetrahydrosecodin-17-ol (IIb) from R. orientalis; (IIb), (III), and 15,20-dihydrosecodine (IV) have been synthesised.
G. A. Cordell, G. F. Smith and G. N. Smith, J. Chem. Soc. D, 1970, 189 DOI: 10.1039/C29700000189
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