Nicaeensin, a new amidinoureido compound from the red alga Schottera nicaeensis

From the basic amino acid fraction of the red alga Schottera nicaeensis, a previously unreported nitrogenous compound has been isolated by chromatography and its structure determined as 1-(3-amidinoureido)-4-(N-methylacetamido)butane (nicaeensin) [1] by degradation and spectroscopic measurements.