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tolonium chloride

(Science: chemical) A phenothiazine that has been used as a haemostatic, a biological stain, and a dye for wool and silk. Tolonium chloride has also been used as a diagnostic aid for oral and gastric neoplasms and in the identification of the parathyroid gland in thyroid surgery.

Pharmacological action: dyes, haemostatics, heparin antagonists.

Chemical name: Phenothiazin-5-ium, 3-amino-7-(dimethylamino)-2-methyl-, chloride