[{"from": "human", "value": "Provide a description of this molecule. [C][C][=C][C][=C][Branch1][=Branch1][C][=C][Ring1][=Branch1][N][S][C][=C][C][=Branch1][=Branch1][=N+1][Branch1][C][C][C][C][=C][C][Ring1][=Branch2][=N][Ring1][S].[Cl-1]"}, {"from": "gpt", "value": "The molecule is an organic chloride salt having 3-amino-7-(dimethylamino)-2-methylphenothiazin-5-ium (tolonium) as the counterion. It is a blue nuclear counterstain that can be used to demonstrate Nissl substance and is also useful for staining mast cell granules, both in metachromatic and orthochromatic techniques. It has a role as a fluorochrome, a histological dye and a diagnostic agent. It contains a tolonium."}]