PMC:7291971 / 49676-49919 JSONTXT

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Rf 0.48 (MeOH/DCM 5:95). 1H NMR (600 MHz, CDCl3) δ 8.33 (s, 2H), 8.16 (s, 1H), 7.92 (s, 1H), 6.11 (d, J = 3.8 Hz, 1H), 6.03 (d, J = 2.3 Hz, 1H), 5.77 (br. s, 4H), 5.47 (dd, J = 6.4 Hz, J = 2.2 Hz, 1H), 4.91 (dd, J = 6.4 Hz, 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