title: 3-Hydr-oxy-3-nitro-methyl-indolin-2-one.
abstract: In the title compound, C(9)H(8)N(2)O(4), the indolin-2-one ring system is substanti-ally planar [maximum deviation = 0.0353 (15) Å]. In the crystal structure, inter-molecular N-H⋯O and O-H⋯O hydrogen bonds are responsible for the formation of a three-dimensional network.
authors.affiliation: Xi'an Shiyou University, College of Chemistry and Chemical Engineering, Dianzi'er Road No. 18 Xi'an 710065, Xi'an, People's Republic of China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Tang
authors.forename: Gang
authors.initials: G
authors.lastname: Chen
authors.forename: Jie
authors.initials: J
authors.lastname: Zhang
authors.forename: Shijun
authors.initials: S
authors.lastname: Chen