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(A) 1H-NMR spectrum (600 MHz, CDCl3) of 3c; (B) magnification of the section between 5.6 and 6.5 ppm; (C) DFT calculated geometry of 3c; (D) NOESY spectrum (600 MHz, CDCl3) of 3c, the EXSY correlation peaks between the CH2 hydrogens are marked with green arrows.
