Synthesis, crystal structure and Hirshfeld analysis of a crystalline compound comprising a 1/1 mixture of 1-[(1,4)- and 1-[(1,4)-1,7,7-trimethyl-2-oxobi-cyclo[2.2.1]heptan-3-yl-idene]hydrazinecarbo-thio-amide.

The equimolar reaction between a racemic mixture of ()- and ()-camphorquinone with thio-semicarbazide yielded the title compound, CHNOS [common name: ()- and ()-camphor thio-semicarbazone], which maintains the chirality of the methyl-ated chiral carbon atoms and crystallizes in the centrosymmetric space group 2/. There are two mol-ecules in general positions in the asymmetric unit, one of them being the (1)-camphor thio-semicarbazone isomer and the second the (1)- 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 (7) and (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.