15500-04-6

Vanadyl oxalate is available:
Thermal decomposition of vanadyl ammonium oxalate loaded with different oxides^[1];
Corrosion inhibition mechanism of vanadium oxalate on hot-dip galvanised steel using galvanic corrosion and XPS methods^[2];
Thermal Analysis, EPR and XPS Study of Vanadyl Oxalate Behavior on the Ceria Surface^[3].

[1] X.S. LI. Thermal decomposition of ammonium vanadyl oxalate supported on various oxides[J]. Thermochimica Acta, 1995. DOI:10.1016/0040-6031(95)90484-0.
[2] ZHIQIANG GAO . The mechanisms of corrosion inhibition of hot-dip galvanized steel by vanadyl oxalate: A galvanic corrosion investigation supported by XPS[J]. Corrosion Science, 2018. DOI:10.1016/j.corsci.2018.07.024.
[3] J. MATTA. Thermal Analysis, EPR and XPS Study of Vanadyl(IV) Oxalate Behavior on the Ceria Surface[J]. Journal of Thermal Analysis and Calorimetry, 2001. DOI:10.1023/A:1013131819569.