4-Chloro-6-(1-methylethoxy)-pyrimidine-d7 is an isotope labelled analog of 4-Chloro-6-(1-methylethoxy)-pyrimidine. 4-Chloro-6-(1-methylethoxy)-pyrimidine is used in the synthesis of pyrimidinyl-substituted thiazolidinediones which has hypoglycemic and hypolipidemic activities.