3,3-Difluoro-5-nitro-1H-indol-2(3H)-one: sheets of R2 2 (8) and R4 6 (34) rings built from three-centre N-H...(O)2 hydrogen bonds.

The title compound, C8H4F2N2O3, crystallizes with Z' = 2 in the space group P2(1)/c. The molecules are linked into sheets of R2(2) (8) and R4(6) (34) rings by two independent asymmetric three-centre N-H...(O)2 hydrogen bonds [H...O = 2.15/2.57 A in one system and 2.23/2.46 A in the other; N...O = 2.8959 (17)/3.2972 (16) and 2.9561 (16)/3.1774 (15) A; N-H...O = 142/140 and 140/139 degrees; O...H...O = 77 and 79 degrees].