diphosgene

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diphosgene (dī´fŏz´jēn), colorless liquid developed as a military poison. It boils at 128°C; its vapors have the odor of phosgene. Diphosgene is a lung irritant but is only slightly lachrimatory. Like phosgene, its effects are often delayed. Chemically it is trichloromethylchloroformate, ClCO2CCl3.

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