In a continuing study of the effect of exposure of chloroquine and its salt derivatives to the sun, the picrate was investigated. The picrate gives a sharp endotbermic effect of melting at 209.2 ~ before it decomposes, to give an exothermic peak at 255.6 ~ The endothermic peak of melting at 209.2 ~ was found suitable for the quantitative determination of chloroquine picrate in sun-exposed samples.
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