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- 2c : 1H NMR(CDCL3): δ (ppm): 2.8–3.3(m, 4H, -CH2-CH2), 3.75(s, 6H, 2xOCH3), 6.65(s, 3H, H-2, H-5 and H-6), 6.75–7.0(m, 2H, H-3′ and H-5′), 7.35(dt, J=9 Hz and 2Hz, 1H, H-4′), 7.65(dd, J=9 Hz and 2 Hz, 1H, H-6′) and 12.20(s, 1H, OH)