Z. naturforsch. (B) Vol. 61b, N 1, 2006, p.83-86.
Synthesis of 6-Thioxo-1,2,5-oxadiazinan-3-ones and Transformation into 3-Amino-2-thiohydantoins and 3-Hydroxy-2-thiohydantoins (In German)
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http://www.znaturforsch.com/ab/v61b/c61b.htm