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This analysis reveals a new polymorphic form of 2-thiohydantoin, indicating unique hydrogen bonding characteristics.
A new polymorphic crystal of the title compound, C3H4N2OS, belongs to space group P1 with cell dimensions of a = 4.0520(9)Å, b = 6.550(1)Å, c = 9.170(2)Å, a = 100.148(4)°, b = 100.814(4)°, g = 96.831(4)°, R1= 0.069. Neighboring molecules are connected to form cyclic dimers via two types of hydrogen bonds, one between the thioamide groups and the other between the amide moieties, showing a distinctive difference from the hydrogen-bonding pattern of the known form. 2009 © The Japan Society for Analytical Chemistry.
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本田 et al. (2009) studied this question.
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