For the published version see https://doi.org/10.1016/j.cjph.2019.09.002 ‘Urea oxalic acid’ is not parabanic acid Aram M. Petrosyan a , Bikshandarkoil R. Srinivasan b* a Institute of Applied Problems of Physics, NAS of Armenia, 25 Nersessyan Str., 0014 Yerevan, Armenia Email: aram.m.petrosyan@gmail.com b School of Chemical Sciences, Goa University, Goa 403206, India Email: srini@unigoa.ac.in Abstract We prove that the recently published “urea oxalic acid” is not parabanic acid but is in fact the well-known bis-urea oxalic acid. Hence the paper by Jeeva et al. (Chin. J. Phys. 56 (2018) 1449-1466) is completely erroneous. Keywords: urea oxalic acid; parabanic acid; improper characterization; misinterpretation; dubious crystal Highlights  Urea oxalic acid (UOA) is not a non-centrosymmetric crystal.  Urea oxalic acid is not parabanic acid.  Parabanic acid can never be prepared from aqueous solution of urea and oxalic acid. * Corresponding author