CHEMISTRY LETTERS, pp. 903-906, 1982. (C) The Chemical Society of Japan 1982 ISOLATION OF FOUR INDOLIZINO[8,7-b]INDOLE-5-CARBOXYLIC ACIDS FROM CLERODENDRON TRICHOTOMUM THUNB Yasuhiro TOYODA, Hiroaki KUMAGAI, Hajime IRIKAWA, and Yasuaki OKUMURA Department of Chemistry, Faculty of Science, Shizuoka University, Oya 836, Shizuoka 422 Four indolizino[8,7-b]indole-5-carboxylic acids were isolated as the ...