Abstract:A novel endoperoxide diterpene, 7α-hydroxy-abieta-8(14)-en-18-ol 9,13α-endoperoxide (compound 1), was isolated from the stems of Microtoena insuavis (Hance) Prain ex Dunn, along with 4,4‘‘-dihydroxytruxillic acid (compound 2), gallic acid (compound 3), ellagic acid (compound 4), 3-O-methylellagic acid 3‘‘-O-α-rhamnopyranoside (compound 5), 3‘‘‘‘‘‘-O-methylcrenatoside (compound 6), crenatoside (compound 7), apigenin (compound 8), succinic acid (compound 9), β-sitosterol (compound 10), and β-daucosterol (compound 11). The structures of these compounds were elucidated on the basis of spectral evidence.(Author for correspondence.Tel (Fax): (0)28 8522 5401; E-mail: zhanggl@cib.ac.cn)