title: (E)-3-Amino-4-(2-phenyl-hydrazinyl-idene)-1H-pyrazol-5(4H)-one.
abstract: The mol-ecule of the title compound, C(9)H(9)N(5)O, is essentially planar (r.m.s. deviation of all atoms = 0.02 Å) except for the NH(2) H atoms. An intra-molecular hydrazinyl-idene-carbonyl N-H⋯O=C hydrogen bond is present. In the crystal, mol-ecules are connected via N-H⋯N/O hydrogen bonds, forming thick layers parallel to (100).
authors: Chemistry Department, Faculty of Science, Helwan University, Cairo,  Egypt.
authors: Galal H
authors: GH
authors: Elgemeie
authors: Shahinaz H
authors: SH
authors: Sayed
authors: Peter G
authors: PG
authors: Jones