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Polymorphism in sulfanilamide-d4.

Thermal behaviors of four crystalline forms of sulfanilamide and of sulfanilamide-d4 have been examined. Heats of transition and fusion have been determined. The deuterated modifications exhibit smaller heats of transition and heats of fusion than the corresponding undeuterated forms. There is, however, a difference in the magnitude of this decrease in the case of the heats of transition.