The molecule is a polypeptide isolated from a marine sponge Theonella sp. and has been found to inhibit the growth of P388 murine leukemia cells. It has a role as a metabolite and an antineoplastic agent.
(2S)-2-[[(2S)-1-[(2S)-1-[(2R)-2-[[(2S)-4-amino-2-[[(2S)-2-[[(2S)-2-[[(2S,3R)-2-[[(2S)-4-amino-2-[[(2S)-2-[[(2R)-2-[(2-methoxyacetyl)amino]-3-phenylpropanoyl]-methylamino]-3-methylbutanoyl]-methylamino]-4-oxobutanoyl]-methylamino]-3-methylpentanoyl]-methylamino]-3-methylbutanoyl]-methylamino]-4-methylpentanoyl]amino]-4-oxobutanoyl]amino]-3-phenylpropanoyl]pyrrolidine-2-carbonyl]pyrrolidine-2-carbonyl]amino]-5-(diaminomethylideneamino)pentanoic acid