The more sparingly soluble portion contained the 3,4-di-hydro-5-acetyl-6- phenyl-1,2,3-oxathiazine-4-one-2,2-dioxide, which was obtained in its pure form by recrystallization from toluene. Colorless crystals, melting point 164° C (decomposition), molar weight 267 (mass spectrum), structu...