The molecule is conjugate acid of Cypridina luciferin; major species at pH 7.3. It is a conjugate acid of a Cypridina luciferin.
3-[2-[(2S)-butan-2-yl]-3-hydroxy-6-(1H-indol-3-yl)imidazo[1,2-a]pyrazin-8-yl]propyl-(diaminomethylidene)azanium