SEARCH Articles Figures Tables Carboxylic esters reaction Diels-Alder reactions of pyrrole-3-carboxylic esters Pyrrole 2-carboxylate Pyrrole Diels-Alder reaction Pyrrole carboxylic esters Pyrrole esters Pyrrole reactions Pyrrole, carboxylation Pyrroles Diels-Alder reaction Pyrroles carboxylation Pyrroles reaction