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Spectral regions of the 1H (600 MHz, CDCl3, 25 °C) spectra including the aromatic ortho (left) and CH (right) signals of substrate 26 in CSA/26 mixture at molar ratio of: (a) 2:1 ([CSA] = 10 mM); (b) 1:1 (([CSA] = 5 mM); (c) 1:2 ([CSA] = 5 mM); (d) 1:3 ([CSA] = 5 mM); (e) 1:4 ([CSA] = 5 mM).
