The title compounds were prepared by the enzymatic resolution of the corresponding N-acetylated DL-amino acids methyl esters, which were obtained from t-butyl c
The process of emulsifier-free copolymerization of the Styrene-Butyl Acrylate-K_sS_sO_s-water in thepresence of Barium Sulfate(BS)powder was investigated under
A simple stepwise folding process has been developed to simulate RNA secondarystructure formation.Modifications for the energy parameters of various loops werei
The structures of three new eremophilanolides isolated from the roots of LigulariaVeitchiana were shown,by the spectral and chemical evidences,to be 1β,10β-ep
The electrophilic aromatic substitution reactions have been studied by using the con-cept of pseudo orbital proposed by authors,Because the unoccupied orbitals
Two new alkaloids namely tuberostemoninal andtuberostemoamide as minor components were isolated from the rootsof Stemona tubeross.Their structures were determin