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2Chemistry of bicyclic ureas. 5. Synthesis of 2,4,6,8-tetraazabicyclo[3.3.0]-3-octanone-7-thiones, Bulletin of the Academy of Sciences of the USSR, Division of chemical science Synthesis of chiral glycolurils from (S)-(+)- and (R)-(-)-1-sec-butyl-3-methylurea, Chemistry of Heterocyclic Compounds