I will greatly appreciate your assistance with the following reference
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J. Appl. Cryst. (2013). 46, 99-107
Cimetidine, C10H16N6S, form C: crystal structure and modelling of polytypes using the superspace approach
A. Arakcheeva, P. Pattison, A. Bauer-Brandl, H. Birkedal and G. Chapuis
doi: http://dx.doi.org/10.1107/S0021889812048133
THanks a lot colleague alisan