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New series histone deacetylase inhibitors comprising a hydroxamic acid or 2-aminobenzamide group as a zinc-chelating function were synthesized and evaluated for antiproliferative activities against a panel of human cancer cells. The 2-aminobenzamide series inhibitors generally had the potency in cell growth inhibitions comparable to that of MS-275. Among… (More)
Support Vector Machines (SVMs) have been dominant learning techniques for almost ten years, and mostly ap- plied to supervised learning problems. Recently two-class unsupervised and semi-supervised classification algorithms based on Bounded C-SVMs, Bounded -SVMs and La- grangian SVMs (LSVMs) respectively, which are relaxed to Semi-definite Programming… (More)
In order to seek a urease inhibitor more potent than hydroxyurea (1), its alkyl- or phenyl-substituted derivatives were synthesized and evaluated for their effect on the jack bean urease. Of 16 compounds tested, m-methyl- (10) and m-methoxy-phenyl substituted hydroxyurea (13) showed the most potent inhibitory activities against the enzyme.
As a continuing study of chemical characterization of crude drug processing, we have been analyzing the chemical constituents in licorice roots before and after processing. At first, we analyzed chemical constituents in licorice roots of various origins. Next, we have developed the HPLC analytical method, by which saponins and flavonoids, major constituents… (More)
Utilizing tranexamic acid as a starting material, a series of N-hydroxycarboxamides were synthesized in order to seek new histone deacetylase (HDAC) inhibitors. Further structure optimization involving the replacement of the 1,4-cyclohexylene group with the 1,4-phenylene group yielded the promising HDAC inhibitors which possess a terminal bicyclic aryl… (More)
From the leaves of Alangium kurzii, a new tetrahydroisoquinoline-monoterpene glucoside, 6-O-methyl-N-deacetylipecosidic acid and a new iridoid glucoside, 10-O-benzoyladoxosidic acid, were isolated along with alangiside, demethylalangiside, 6''-O-beta-D-glucosylhenryoside, uridine and four known flavonoid glycosides. The structures of new glucosides were… (More)
A new acetophenone glycoside, affinoside, was isolated from the aerial parts of Exacum affine and its structure was determined as 2-O-primeverosylpaenol. The known glucosides, gentiopicroside, 2'-O-E/Z-p-coumaroylloganin and glucopaeonol, were also identified.