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. 2022 Jun 24;13:3616. doi: 10.1038/s41467-022-31352-x

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Fig. 4 — a FTIR spectra. The stretching vibration band of aromatic C−D is beyond the range of the FTIR (<450 cm⁻¹). b ¹H NMR spectra. Reaction conditions: 200 °C, 20 MPa. c Solid product from the hydrothermal process of different substrates at 200 °C and 20 MPa.