英文别名2-oxo-2-thien-2-ylacetic acid methyl ester; 2-oxo-2-(thiophen-2-yl)acetic acid methyl ester; methyl 2-thienylglyoxylate; 2-(carbomethoxycarbonyl) thiophene; methyl α-thienylglyoxylate; methyl 2-(2-thienyl)-2-oxoacetate; Tiotropium Bromide Impurity 18; Aclidinium Impurity 1; Methyl 2-Oxo-2-(2-thienyl)acetate; 2-Thiopheneacetic acid, α-oxo-, methyl ester; 2-Thiopheneacetic acid, a-oxo-, methyl ester; Methyl α-oxo-2-thiopheneacetate 
