20566-30-7 2H-1,2-Benzothiazine-2-acetic acid, 3-(ethoxycarbonyl)-4-hydroxy-, ethyl ester, 1,1-dioxide 2H-1,2-Benzothiazine-2-acetic acid, 3-carboxy-4-hydroxy-, diethyl ester, 1,1-dioxide Ethyl-3-ethoxycarbonyl-4-hydroxy-2H-1,2-benzothiazine-2-acetate 1,1-dioxide MCN 2165 MCN-2165