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(a) Optical microscope of BHET crystal; the inset of (a) is image of white crystalline of purified products. (b) XRD patterns of the BHET. (c) FTIR spectra of BHET and PET. (d) 1H-NMR and 13C-NMR spectrum of BHET in DMSO-d6 (500 MHz, 125 MHz).
