2,4,5,6,7,8-Hexahydro-1,2,3a,6-tetraaza-azulen-3-one

2,5,6,7,8,9-Hexahydro-3H-1,2,4-triazolo[4,3-d][1,4]diazepin-3-one

6,7,8,9-tetrahydro-2H-[1,2,4]triazolo[4,3-d][1,4]diazepin-3(5H)-one