Acta Crystallographica Section E (Sep 2008)
1′,5-Dinitro-2′-phenyl-2′,3′,5′,6′,7′,7a'-hexahydrospiro[indoline-3,3′-1′H-pyrrolizin]-2-one
Abstract
In the title cycloadduct, C20H18N4O5, the rings of the pyrrolizine system adopt envelope conformations. A centrosymmetric dimer is formed via intermolecular N—H...O hydrogen bonds between the indolinone rings.
