... silica gel using hex-ane-EtOAc, mixtures of increasing polarity consisting of four kaurenoid carboxylic acids:(–)-kaur-16-en-19-oic acid (28), (–)-grandifloric acid, (–)-angeloylgrandifloric ... 1988.15a. Uribe, S. and Peña, A. J. Chem. Ecol., 16, 1399, 1990.15b. Peñuelas, J., Ribas-Carbo, M., and Giles, L. J. Chem. Ecol., 22, 801, 1996.15c. Cruz-Ortega, R., Anaya, A.L., Gavilanes-Ruiz, ... acids:(–)-kaur-16-en-19-oic acid (28), (–)-grandifloric acid, (–)-angeloylgrandifloric acid (29), andthe (– )-1 7-hydroxy-16β-kauran-19-oic acid (30) (Figure 2.7).In general, clear inhibitory effects were observed on...