Supplementary material. Application of a fluorescent H2S probe based on ESIPT for detecting latent mechanism of H2S induced MCF-7 apoptosis

Fig. S1 Synthesis route for probe FHS-1. Fluorophore 4'-dimethylamino-3-hydroxyflavone (compound 4) (step 1-3) and recognition group 4-chloro-7-nitrobenzo-2-oxa-1, 3-diazole (NBD-Cl) (step 5-7) were synthesized. FHS-1 was obtained by connecting them via ether bond (step 8).