the traditional logician’s explanation on categorical syllogism, make the analysis of controversial syllogism and other relative syllogism, very difficult. the thirteenth century logicians use two methods to solve this problem. one method is ibn sina's method, which adds a premise to syllogism, and the second method is fakhr al-din al-razi and katebis’ method, which provide syllogism relyi...

A new steroidal saponin was isolated from the leaves of Agave shrevei Gentry. Its structure was established as 26-(beta-D-glucopyranosyloxy)-22-methoxy-3-(O-beta-D-glucopyranosyl-(1-->2)O-[O-beta-D-glucopyranosyl-(1-->4)-O-[O-beta-D-glucopyranosyl-(1-->6)]-O-beta-D-glucopyranosyl(1-->4)-beta-D-galactopyranosyl]oxy)-(3beta,5alpha,25R)-furostane. The structural identification was performed using ...