2RQO:
reference: Solution Structure of Polytheonamide B, a Highly Cytotoxic Nonribosomal Polypeptide from Marine Sponge., Hamada T, Matsunaga S, Fujiwara M, Fujita K, Hirota H, Schmucki R, Guntert P, Fusetani N, J Am Chem Soc. 2010 Aug 26. PMID: 20795624

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