The structure of the Kopsins. (Preliminary communication)

Govindachari, T. R. ; Pai, B. R. ; Rajappa, S. ; Viswanathan, N. ; Kump, W. G. ; Nagarajan, K. ; Schmid, H. (1962) The structure of the Kopsins. (Preliminary communication) Helvetica Chimica Acta, 45 (4). pp. 1146-1152. ISSN 0018-019X

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Structure X:R = H2 has been derived for the alkaloid kopsine from chemical and spectroscopic evidence and by a correlation with the alkaloid pleiocarpine (IX: R = R1 = COOCH3; R2 = H2). Structures XI: R = H2; R1 = OH; R2 = H and XI: R = H2; R1 = H; R2 = OH, respectively, represent dihydrokopsine-A and dihydrokopsine-B.

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