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In the title mol­ecule, C 9 H 10 N 2 O 3 , the hydrazinecarboxylic acid mean plane and the benzene ring form a dihedral angle of 11.1 (1)°. In the crystal structure, inter­molecular N—H⋯O hydrogen bonds link the mol­ecules into chains extending along the  b  axis. An intra­molecular O—H⋯N hydrogen bond is also present.

(E)-MethylN′-(2-hydroxybenzylidene)hydrazinecarboxylate at 123 K