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The equimolar reaction between a racemic mixture of ( R )- and ( S )-camphorquinone with thio-semicarbazide yielded the title compound, C 11 H 17 N 3 OS [common name: ( R )- and ( S )-camphor thio-semicarbazone], which maintains the chirality of the methyl-ated chiral carbon atoms and crystallizes in the centrosymmetric space group C 2/ c . There are two mol-ecules in general positions in the asymmetric unit, one of them being the (1 R )-camphor thio-semicarbazone isomer and the second the (1 S )- isomer. In the crystal, the mol-ecular units are linked by C-H⋯S, N-H⋯O and N-H⋯S inter-actions, building a tape-like structure parallel to the (01) plane, generating R  2  1 (7) and R  2  2 (8) graph-set motifs for the H⋯S inter-actions. The Hirshfeld surface analysis indicates that the major contributions for crystal cohesion are from H⋯H (55.00%), H⋯S (22.00%), H⋯N (8.90%) and H⋯O (8.40%) inter-actions.

acta crystallographica. section e, crystallographic communications

Synthesis, crystal structure and Hirshfeld analysis of a crystalline compound comprising a 1/1 mixture of 1-[(1R,4S)- and 1-[(1S,4R)-1,7,7-trimethyl-2-oxobicyclo[2.2.1]heptan-3-ylidene]hydrazinecarbothioamide