The benzene solution was dried and concentrated. The crystalline residue was recrystallized from benzeneether and washed on the filter with ether, yield 1.28 g., m. p. 177-180°. An additional 0.17 g. was obtained from the mother liquor (total 83%). Recrystallization from the same solvent raised the m. p. to 189-190.5°, [ ]27 -46.5 =*= 3°( dioxane).
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