1',5-Dinitro-2'-phenyl-2',3',5',6',7',7a'-hexa-hydro-spiro-[indoline-3,3'-1'H-pyrrolizin]-2-one

Acta Crystallogr Sect E Struct Rep Online. 2008 Aug 13;64(Pt 9):o1740. doi: 10.1107/S1600536808025038.

Abstract

In the title cyclo-adduct, C(20)H(18)N(4)O(5), the rings of the pyrrolizine system adopt envelope conformations. A centrosymmetric dimer is formed via inter-molecular N-H⋯O hydrogen bonds between the indolinone rings.