SEARCH Articles Figures Tables 2- thiophene, Diels-Alder reactions Benzo thiophene Diels-Alder reaction Benzo thiophene, Diels-Alder reactions structure Benzo thiophene, Diels-Alder reactions synthesis Benzo thiophenes Diels-Alder reaction Thiophene 1-oxides, Diels-Alder Thiophene 1-oxides, Diels-Alder reaction Thiophenes Diels—Alder reaction