5-(4-(2-(5-Ethylpyridin-2-yl)ethoxy)benzylidene)thiazolidine-2,4-dione;5-[4-[2-(5-Ethyl-2-pyridinyl)ethoxy]benzylidene]- 2,4-thiazolidinedione;5-{4-[2-(5-Ethyl-2-pyridinyl)ethoxyl]benzyldene}-2,4-thiazolidinedione;5-[[4-[2-(5-Ethyl-2-pyridinyl)ethoxy]benzylidene]-2,4-thiazolidinedione;5-[[4-[2-(5-Ethyl-2-pyridinyl)ethoxy]phenyl]-methylene]-2,4-thiazolidinedione (Pioglitazone Impurity);5-[[4-[2-(5-Ethyl-2-pyridinyl)ethoxy]phenyl]-methylene]-2,4-thiazolidinedione (Pioglitazone Impurity);{[(ethyl-5-pyridyl-2-)ethoxy-4-]benzylidene}-5-thiazolidine-2,4-dione-2,4;5-[[4-[2-(5-ethyl-2-pyridinyl)ethoxy]phenyl]methylene]-thiazolidine-2,4-dione;5-[4-[2-(5-ethyl-2-pyridyl) ethoxy]benzilidene]-2,4-thiazolidinedione;5-{[4-(5-ethyl-2-pyridyl)ethoxy]benzylylidene}-2,4-thiazolidine-2,;5-{4-[2-(1,3-dioxolan-2-yl)-ethoxy]benzyl}thiazolidine-2,4-dione;5-{4-[2-(5-Ethyl-pyridin-2-yl)-ethoxy]-benzylidene}-thiazolidine-2,4-dione;5-{4-[2-(5-ethylpyridn-2-yl)ethoxy]benzylidene}-2,4-thiazolidene dione;CTK0I4438;5-[4-[2-(5-Ethyl-2-pyridinyl)ethoxy]benzylidene]-1,3-thiazolidine-2,4-dione;5-[4-[2-(5-Ethyl-2-pyridyl)ethoxy]benzylidene]thiazolidine-2,4-dione;5-[4-[2-(5-Ethylpyridin-2-yl)ethoxy]benzylidene]thiazolidine-2,4-dione;25kgs;Pioglitazone IMpurity B;Pioglitazone EP IMpurity B;Didehydro Pioglitazone Impurity;5-[[4-[2-(5-ethyl-2-pyridinyl)ethoxy];5-{4-[2-(5-Ethyl-pyridin-2-yl)-ethoxy]-;5-(4-(2-(5-ETHYL-2-PYRIDINYDETHOXY)BENZYLIDENE)-2,4-THIAZOL;5-{4-[2-(5-Ethyl-2-pyridinyl)ethoxyl]benzylene}-2,4-thiazolidinedione;(E)-4-(4-(2-(5-ethylpyridin-2-yl)ethoxy)benzylidene)thiazolidin-5-one;5-[4-[2-(5-Ethyl-pyridin-2-yl-ethoxy)benzyldene]thiazolidine-2,4-dione