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Leonurine (1) (4.0 g, 65% yield ) as
a white solid. 1H NMR (400 MHz, CF3COOD): ¦Ä 7.38 (s, 2H), 4.42 (t, 2H, J = 6.2 Hz), 3.91 (s, 6H), 3.30 (t, 2H, J = 6.7 Hz), 1.89 (dt,
2H, J = 13.3, 6.5 Hz), 1.83 ¨C 1.71 (m, 2H). lit.[18] 1H NMR (400 MHz, CF3COOD): ¦Ä 7.36 (s, 2H), 4.3 ~ 4.55 (br, 2H), 3.94 (s, 6H),
3.15 ~ 3.45 (br, 2H), 1.75 ~ 2.05 (br, 4H).

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