[{"from": "human", "value": "Provide a description of this molecule. [C][=C][C][=C][Branch1][=Branch1][C][=C][Ring1][=Branch1][N][S][C][=C][C][=Branch1][C][=NH2+1][C][=C][C][Ring1][#Branch1][=N][Ring1][=C].[Cl-1]"}, {"from": "gpt", "value": "The molecule is an organic chloride salt composed of 3,7-diaminophenothiazin-5-ium and chloride ions in a 1:1 ratio. A strongly metachromatic dye, useful for the staining of acid mucopolysaccharides. It is also a common nuclear stain and can be used for the demonstration of Nissl substance in nerve cells of the CNS. It has a role as a histological dye and a fluorochrome. It contains a thionine cation."}]