Figure 7

Small molecules involved in the bioluminescence of the glowworm and the firefly. (A) Possible XA-Tyr amide. (B) Possible quinoline-N-linked structure. (C), (D) Candidate structures of A. luminosa LRC. (E) Coleoptera D-luciferin, found in fireflies, click beetles and railroad worms. (F) L-Tyr. (G) XA. “a” indicates protons exchangeable with deuterium under acid conditions.