(Rac)-Luciferin 6′-methyl ether (sodium)
D-Luciferin 6′-methyl ether (6′-Methoxyluciferin; compound 19a) sodium is a potent luciferase from the North American firefly Photinus pyralis (PpyLuc) inhibitor with an IC50 of 0.1 μM. D-Luciferin 6′-methyl ether, a D-luciferin analog, shows non-specific interactions at ATP- and luciferin-binding sites of the PpyLuc active site.