3-Azabicyclo[3.3.1]nonane-2,4-dione: CSP2001 structure prediction test case No. 1

Features of the structure of the title compound, C8H11NO2, are the near pla nar arrangement of the dicarboximide fragment and the C atoms alpha to it a nd the molecular noncrystallographic C-s mirror symmetry. N-H . . .O hydrog en bonds link the molecules to form zigzag chains propagated in the a direc tion and sheets parallel to (001) are formed by replication of the chains b y cell translation in the b direction. The sheets, related to one another b y the operation of crystallographic centres of symmetry, are stacked in the c direction.