RAI, B.K.; CHOUDHARY, Pramod. Synthesis and Characterization of Transition Metal Complexes of 2-(p-chlorophenyl)-4,5-Dimethyl (8H) Pyrimido [4,5-d] Pyrimidine Semicarbazone and Thiosemicarbazone . Asian Journal of Chemistry, [S. l.], v. 14, n. 1, p. 312–318, 2010. Disponível em: https://asianpubs.org/index.php/ajchem/article/view/22012. Acesso em: 4 jul. 2024.