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2 (15.12g, 0.08 mol) in methanol (250 ml). After 30 minutes, 2-mercaptoethanol (6.25 g, 0.08 mol) was added and stirring was continued for another 2 h. The light yellow product was filtered, washed with methanol, diethyl ether and finally air-dried for 24 h. The yield was almost quantitative. Under normal circumstances the compound retains activity for one month.
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