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also dihydrophenylarsazine chloride, HN(C6H4)2AsCl; a yellow crystalline powder. Its melting point is 195°C. It is insoluble in water, weakly soluble in most organic solvents, and chemically stable. Adamsite is made from diphenylamine (C6H5)2NH and arsenic trichloride AsCl3 or from diphenylamine chlorohydrate (C6H5)2NH · HC1 and arsenous anhydride As303. Adamsite is one of the groups of substances which irritate the upper respiratory paths (sternutators). At the end of World War I, it was classified as a poison gas.