Abstract

From the aerial parts of Calceolaria paralia, a new diterpene ,19-butyloxy-9alpha-hydroxy-13-epi-ent-pimara-15-ene (1), together with 13-epi-ent-pimara-9(11)15-diene-19-oic acid (2), 9alpha,19-dihydroxy-13-epi-ent-pimara-15-ene(3) , 19-acetoxy-13-epi-ent-pimara-9(11)15-diene (4), bis malonate(13-epi-ent-pimara-9(11),15-diene-19-yl) (5) and ent-stemar-13(14)en-19-oic acid (6) . Their structures were elucidated by spectroscopic means