艾托格列净杂质20
QY-ATJ-20
((1R,2S,3S,4R,5S)-5-(4-chloro-3-(4-ethoxybenzyl)phenyl)-2,3,4-trihydroxy-6,8-dioxabicyclo[3.2.1]octan-1-yl)methyl (S)-5-oxopyrrolidine-2-carboxylate