[{"from": "human", "value": "Please give me some details about this molecule. [C][=C][C][=Branch2][Ring1][=Branch1][=C][Branch1][#Branch2][C][=C][Ring1][=Branch1][N+1][=Branch1][C][=O][O-1][O][S][=Branch1][C][=O][=Branch1][C][=O][O][O]"}, {"from": "gpt", "value": "The molecule is an aryl sulfate that is 4-nitrocatechol in which the hydroxy group that is meta to the nitro group has been converted into the corresponding hydrogen sulfate. It is used (commonly as its dipotassium salt) as a chromogenic substrate for sulphatase. It has a role as a chromogenic compound. It is a member of 4-nitrophenols and an aryl sulfate. It is functionally related to a 4-nitrocatechol."}]