Unusual 2(1H)-Pyrazinones Isolated from a Culture of a Brazilian Marine-Derived Streptomyces sp.

摘要

Four new secondary metabolites, giovaninones A-D (1-4), were isolated from an ethyl acetate extract of a culture of a marine-derived Streptomyces strain designated SS99BA-2. Chemical analysis was completely conducted in a coupled automated LC-SPE system with the use of a cryogenic NMR probehead and FIRMS. The application of this system to identify, purify and elucidate all the structures is described.