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(Science: chemical) A photographic fixative used also in the manufacture of resins. According to the fourth annual report on carcinogens (ntp 85-002, 1985), this substance may reasonably be anticipated to be a carcinogen (merck index, 9th ed). Many of its derivatives are antithryoid agents and/or free radical scavengers.

Pharmacological action: antithyroid agents, carcinogens, free radical scavengers, indicators and reagents.

Chemical name: Thiourea