SEARCH Articles Figures Tables 3-formyl-pyrrole Acylation/formylation Formylations, Vilsmeier-Haack Haack Haack Formylation Pyrrole Vilsmeier acylation Pyrrole Vilsmeier-Haack formylation Pyrrole, 3- acylation Pyrrole, 3-acyl Pyrroles, formylation Vilsmeier Vilsmeier formylation Vilsmeier-Haack Vilsmeier-Haack acylation Vilsmeier-Haack formylation