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An unusual sulfated mannose homopolysaccharide (1) showing in vitro anti-HIV activity has been isolated from the mucous secretion of the Pacific tunicate Didemnum molle. Analysis of 1 H and 13 C NMR data of the polysaccharide and its desulfated derivative 2 revealed that it consists of a sequence of 2,3-disulfated mannose units joined through β (1,6) glycosidic linkages.
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