Structure elucidation and anticancer activity of 7-oxostaurosporine derivatives from the Brazilian endemic tunicate Eudistoma vannamei - Jimenez, P C; Wilke, D V; Ferreira, E G; Takeara, R; De Moraes, M O; Silveira, E R; Lotufo, T MDC; Lopes, N P; Costa-Lotufo, L V (Mar Drugs, 2012)