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. 2022 Jan 11;13:223. doi: 10.1038/s41467-021-27809-0

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Fig. 6 — The spectrum of the precursor 7b is in blue, with a strong CO peak at 1781 cm⁻¹ and that one of the resulting nonacene 1 is in red, after 1 min. heating at 350 °C in glovebox.