摘要:
Compounds of the formula: ##STR1## wherein R.sub.1 is hydroxy, phosphonooxy, aminoglycosyloxy, acylaminoglycosyloxy, benzyloxycarbonyloxy, arylcarbonyloxy, trialkylammonio-acyloxy or furoyloxy; R.sub.2 and R.sub.3 each are lower alkoxy; and R.sub.4 is benzimidazolyl, furyl which is unsubstituted or substituted with lower alkyl, thienyl which is unsubstituted or substituted with lower alkyl, or phenyl which is substituted with lower alkyl, lower alkoxy, alkoxyalkoxy, alkylthio, alkylenedioxy, or acyloxy, with the proviso that when R.sub.1 is hydroxy, R.sub.4 is benzimidazolyl or phenyl which is substituted by acyloxy or alkoxyalkoxy, or pharmaceutically acceptable salts thereof useful as antiviral agents.
摘要:
A pentadecapeptide and salts thereof with immunopotentiating activity is presented. Also presented is a fermentation process for the preparation of the pentadecapeptide by a microorganism of the genus Streptoverticillium and pharmaceutical preparations containing the peptide or its salts.
摘要:
Antivirally active compounds of the formula ##STR1## wherein R.sup.1 represents hydroxy, acyloxy derived from an aliphatic acid having 2-18 carbon atoms or a heterocyclic carboxylic acid containing nitrogen atom(s), lower alkoxycarbonyloxy, aminoacyloxy or carboxyalkanoyloxy;R.sup.2 represents lower alkoxy;R.sup.3 represents hydrogen or lower alkoxy; andR.sup.4 represents phenyl which may be substituted by one or more substituents selected from the group consisting of lower alkyl, lower alkoxy, benzyloxy, allyloxy, alkylthio, dialkylamino, amino, cyano, hydroxy, halo and alkylenedioxy; or pyridyl, furyl, thienyl or pyrrolyl which may be substituted by lower alkyl,pharmaceutical compositions containing them and a process for the preparation of those compounds of formula I which are novel.
摘要:
This invention relates to Trestatin A, Trestatin B and Trestatin C salts thereof and mixtures thereof as well as compositions containing at least one of the Trestatins A, B or C or a salt thereof. These compositions are useful for the inhibition of sucrase and inhibition of alpha-amylase.
摘要:
The present invention is concerned with a process for the manufacture of optically active .alpha.-hydroxycarboxylic acids, especially a process for the manufacture of optically pure D- or L-.alpha.-hydroxycarboxylic acids.
摘要:
New guanidino derivatives of kasugamycin in which the oxalamidino group at the 4-position of kasugamycin molecule has been replaced by different guanidino groups are produced and found to show an improved antibacterial activity against Gram negative bacteria and a decreased toxicity to man and animals, as compared to kasugamycin itself. The new guanidino derivatives of kasugamycin may readily be produced by reacting an amine with an isourea derivative of kasugamycin which has been prepared by reacting sodium hypobromite with kasugamycin and then treating the resulting cyanamide derivative with hydrogen chloride in methanol.