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. 2021 Mar 25;12:1997. doi: 10.1038/s41467-021-21817-w

Fig. 2. Formation of the oxalate complex 4 from 3 requires O2 and does not require CO2.

Fig. 2

FTIR spectra for the products obtained when 3 (prepared in situ from 1 and ascorbate) was exposed to air (grey) or pure O2 (green) are identical (details are given in the ESI).