PMC:7291971 / 43201-43428 JSONTXT

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Rf 0.71 (MeOH/DCM 5:95). 1H NMR (600 MHz, CDCl3) δ 8.33 (s, 1H), 8.30 (s, 1H), 8.17 (s, 1H), 7.93 (s, 1H), 6.09 (d, J = 3.3 Hz, 1H), 6.01 (d, J = 2.4 Hz, 1H), 5.97 (m, 4H), 5.42 (dd, 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