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Magn Reson Chem. 2005 Jul;43(7):595-8.

Structural and spectral assignment of three forskolin-like diterpenoids isolated from Plectranthus ornatus.

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  • 1Faculdade de Farmácia da Universidade de Lisboa, CECF, Av. Prof. Gama Pinto, 1649-003 Lisbon, Portugal.

Abstract

Three labdane diterpenoids were isolated from an acetone extract of Plectranthus ornatus. Their structures, closely related to that of forskolin, were determined by NMR studies. Unambiguous and complete assignments of the 1H and 13C NMR chemical shifts for these substances are presented. The assignments are based on 2D shift-correlated [1H, 1H-COSY, 1H, 13C-gHSQC-1J (C,H), 1H, 13C-gHMBC-(n)J (C,H) (n = 2 and 3)] and NOE experiments.

Copyright 2005 John Wiley & Sons, Ltd

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