Antimicrobial -abietane-type diterpenoids from the roots of .

Three previously undescribed -abietane-type diterpenoids, designated as 11-hydroxy-14-oxo-17-al--abieta-8(9),13(15)-dien-16,12-olide (), 11,17-dihydroxy-12-methoxy--abieta-8(14),13(15)-dien-16,12-olide (), and 14-hydroxy-17-al--abieta-7(8),11(12),13(15)-trien-16,12-olide (), were isolated from 95% ethanol extract of the roots of . The structures of the new compounds were elucidated by spectroscopic analysis (NMR, IR, UV, and MS). The isolated diterpenoids were tested for antimicrobial potentials against 6 pathogenic microorganisms. As a result, compounds - exhibited some antimicrobial activity against the tested Gram positive bacteria with minimum inhibitory concentration values less than 60 μg/ml.[Formula: see text].