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A sponge of the lithistid family Theonellidae from southern Mozambique contained the known compound aurantoside A ( 1 ) together with two new cyclic peptides, mozamides A ( 2 ) and B ( 3 ). The structures and absolute configurations of mozamides A and B, which contain a rare ureido group, were determined by interpretation of spectral data and chiral GC−MS analysis of the amino acids resulting from acid-catalyzed hydrolysis.
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Schmidt et al. (1997) studied this question.
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