Title: Ethyl 3,4-dimethyl-1H-pyrrole-2-carboxyl-ate.
Journal: Acta crystallographica. Section E, Structure reports online 20100901
Title: Ethyl 5-formyl-3,4-dimethyl-1H-pyrrole-2-carboxyl-ate.
Journal: Acta crystallographica. Section E, Structure reports online 20090701