octahydro-2-nitrosocyclopenta[c]pyrrole;N-Nitroso-3-azabicyclo[3.3.0]octane;2-Nitroso-octahydrocyclopenta[c]pyrrole;Gliclazide EP Impurity B;Gliclazide Impurity 2(Gliclazide EP Impurity B);Gliclazide impurity B CRS;2-Nitroso-octahydrocyclopenta[c]pyr;Cyclopenta[c]pyrrole, octahydro-2-nitroso-