Three chiral stationary phases(CSP1, CSP2 and CSP3)for ligand-exchange chromatography were prepared by firstly using dimethylchlorosilane as an endcapping reage
Thirteen novel sulfonylureas containing thiadiazole moiety were synthesized in a two-step reaction. Their structures were determined using IR, 1H NMR, HRFTMS, a
Ursolic acid was modified at C3 and C28 position to obtain fourteen derivatives including twelve novel compounds, and their chemical structures were characteriz