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1H NMR spectra of compounds from Odontosyllis. (A) Luciferin in methanol-d4 at 10 °C, 800 MHz. (B) Oxyluciferin in H2O + 10% D2O at 15 °C, pH 3.3 (800 MHz) and pH 6.0 (600 MHz). (C) Pink in H2O + 10% D2O at 15 °C, pH 2.5 (800 MHz). Impurities are labeled by asterisks; signals of the compounds are labeled with numbers (SI Appendix, Table S1 and Figs. S6, S8, and S14).
