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Limbatolide F and G: Two New trans-Clerodane Diterpenoids from Otostegia limbata

Farooq U., Khan A., Ahmad V., Kousar F., Iqbal S.

Polish Journal of Chemistry

2005

Vol. 79 / nr 11

1757-1762

Two new trans-clerodane diterpenoids pro vi sion ally named as limbatolide F (1) and limbatolide G (2) were isolated from the chloroform extract of Otostegia limbata. Both compounds 1 and 2 have a unique feature of C-4/C-6 five membered a,b-un saturated lactone. The structures of these new compounds as well as their relative configurations were determined by 1D and 2D NMR techniques including COSY, HMQC, HMBC, NOESY and NOE experiments.