Zaslat záznam emailem: A hydrogen-bridged adduct 3,4,6,7,8,9-hexa­hydro-2H-pyrimido[1,2-a]pyrimidin-1-ium [1,3-bis­(tert-butyl­dimethyl­sil­yloxy)-1,3-bis­(pyridin-2-yl)propan-2-yl­idene]nitro­nate acetonitrile monosolvate