C~21~H~22~N~4~NiO~2~S~2~, 4.5(H~2~ O). C21H31N4NiO6.5S2 [eCrystal] Smith, Paul D. and Light, Mark E. and Hursthouse, Michael B. (2003) (doi:10.3737/ecrystals.chem.soton.ac.uk/1215)