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Experimental 1H NMR and computed proton chemical shifts for: A) H1/H3avg and H5 in tri-t-butyl-pentalene (H1/H3avg: 5.07 ppm, H5: 4.72 ppm, expt., reference [28]), B) H1 and H5 in benzopentalene (H1: 6.12 ppm, H5: 6.36 ppm, expt., reference [29]), C) H9 and H10 in DCN (H9: 7.25 ppm, H10: 6.72 ppm, expt., reference [31]), and D) H1, H2, and H10 in anthracene (H1: 7.98 ppm, H2: 7.44 ppm, H10: 8.39 ppm, expt., reference [32]).
