Monomargine, a nitrogenous cytotoxic pigment from Monocarpia marginalis

Abstract Monomargine 1 , a new nitrogenous pigment, was isolated from the bark of Monocarpia marginalis and its structure elucidated by 2D NMR analysis. 1 exibited cytotoxic activity in vitro against the growth of KB and P388 cells (IC 50 0.7 μ/ml).