SMILES: C1=CC2=C(C=C1[O-])SC(=N2)C3=NC(=CS3)O
Description: The molecule is the conjugate base of oxidized Photinus luciferin arising from removal of the acidic proton at the 5-position of the thiazol-4-one ring; major species at pH 7.3. It is a conjugate base of an oxidized Photinus luciferin.