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Chemical structures of d-luciferin and its red-shifted derivatives: (a) d-luciferin, (b) NH2-NpLH2, (c) OH-NpLH2, (d) 6′-aminoluciferin, (e) CycLuc1, (f) CycLuc2, (g) CycLuc7, (h) CycLuc10 (i) Infra-luciferin, (j) Akalumine-HCl, (k) PhOH-Luc.
