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The title compound, C12H16N4OS, is zwitterionic and exists in the EZ configuration of thio­semicarbazones. The thio­carbon­yl S atom and coordinating pyrid­yl N atom are aligned cis to each other, avoiding the possibility of a structural reorientation upon coordination. Two crystallographically independent mol­ecules, A and B, are observed in the asymmetric unit, with the morphol­yl ring adopting a chair conformation in both mol­ecules. N—H...N and N—H...S intra­molecular hydrogen bonds are observed in the mol­ecular structure, generating four rings of motif R12(5). There is zigzag packing in the unit cell, involving both intra- and inter­molecular hydrogen-bonding inter­actions.

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The title compound, C6H8N4S, crystallizes as the thione tautomer, with intra­molecular N...H—N and S...H—N hydrogen bonds, and π–π stacking along the b axis. Inter­molecular N...H—N hydrogen bonds link the mol­ecules into one-dimensional sheets stacked along the c axis.
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