CAY10731 is a fluorescent probe for hydrogen sulfide (H2S).[1] Upon reaction with H2S, fluorescein (FITC) is released and its fluorescence can be used to detect H2S. FITC displays excitation/emission maxima of 485/535 nm, respectively. CAY10731 is selective for H2S over glutathione (GSH), cysteine, H2O3-, SO3-, and H2O2 as well as tBuO and OH radicals. It has been used to detect H2S in rat hippocampal slices and nematodes.
Reference:
[1]. Reja, S.I., Sharma, N., Gupta, M., et al. A highly selective fluorescent probe for detection of hydrogen sulfide in living systems: In vitro and in vivo applications. Chemistry 23(41), 9872-9878 (2017).