Fig. 1: Representative organic fluorophores.
From: Acyl radical to rhodacycle addition and cyclization relay to access butterfly flavylium fluorophores

a Nitrogen-based fluorophores. b Oxygen-based fluorophores.
From: Acyl radical to rhodacycle addition and cyclization relay to access butterfly flavylium fluorophores

a Nitrogen-based fluorophores. b Oxygen-based fluorophores.