Assay-guided fractionation of the antitubercular MeOH-CH2Cl2 extract obtain
ed from Lippia turbinata led to the isolation of four novel triterpenoidls-
3 beta ,25-epoxy-3 alpha ,21 alpha -dihydroyloxy)olean-12-ene-28-oic acid (
1); 3 beta ,25-epoxy-3 alpha ,21 alpha -dihydroxy-22 beta -angeloyloxylean-
12-ene-28-oic acid (2); 3 beta ,25-epoxy-3 alpha ,21 alpha -dihydroxy-22 be
ta -tigloyloxylean-12-ene-28-oic acid (3); and 3 beta ,25-epoxy-3 alpha -hy
droxy-22 beta-(2-methylbutan-1-oyloxy)olean-12-ene-28-oic acid (4)-together
with the known triterpenoids lantanilic acid (5), camaric acid (6), lantan
olic acid (7), and rehmannic acid (8). The MIC values of 1-8 for growth inh
ibition of Mycobacterium tuberculosis were determined in the radiorespirome
tric BACTEC system.