[{"from": "human", "value": "Describe this molecule. [C][C][Branch1][Ring2][O][Ring1][Ring1][C][O][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][C][=Branch1][#C][=C][C][=C][C][=Branch1][C][=O][C][=C][Ring1][#Branch1][O][Ring1][=N][C][=C][C][=C][C][=C][Ring1][=Branch1][C][=Branch1][C][=O][O][C][C][C][O][Ring1][Ring1]"}, {"from": "gpt", "value": "The molecule is an epoxide fluorescent probe for use in in vivo visualization of hydrogen sulfide. The probe employs a fluorescein as a fluorophore, and is equipped with an operating epoxide unit. FEPO functions via epoxide ring opening via nucleophilic attack by H2S. It has a role as a fluorescent probe. It is an epoxide, a benzoate ester, an aromatic ether and a xanthene dye. It is functionally related to a fluorescein (acid form)."}]