Two polyheteroaromatic alkaloids from the Ascidian cystodytes delle chiajei from Brazil - Torres, Yohandra Reyes; Berlinck, Roberto Gomes de Souza; Bugni, Tim S.; Ireland, Chris M.; Magalhães, Alviclér; Ferreira, Antonio G.; Rocha, Rosana M. (Annual Meeting of the American Society of Pharmacognosy, 2001)