Unveiling the effects of tautomerism on the electronic spectrum of sulfapyridine: a joint theoretical and experimental study - Santos, José Luiz Felix; Souza, Felipe Guimarães de; Souza, Fernanda de Lourdes; Souza, Gabriel L.C. de; Haiduke, Roberto Luiz Andrade (International Congress of Theoretical Chemists of Latin Expression Cartagena - Quitel, 2025)