The antiviral activity of the phenanthrene derivatives 1-6, of the spyrostane triglycosides dioscin (7) and gracillin (8), of the furostanol tetraglycosides methylprotodioscin (9), its (25S) epimer methylprotoneodioscin (10), and methylprotogracillin 11, have been tested towards two RNA viruses: vesicular stomatitis virus and human rhinovirus type 1B. All these products were extracted from the rizomes of Tamus communis L; compound 11 was isolated also from Asparagus cochinchinesis, together with pseudoprotodioscin (12), a 20 (22)-unsaturated furostanoside, which was also investigated for antiviral activity. The results were of some interest mainly for the phenanthrene derivatives.
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Aquino et al. (1991) studied this question.
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