*(1E,6E)-4,4-Dibutyl-1,7-bis(4-hydroxy-3-methoxyphenyl)hepta-1,6-diene-3,5-dione* (**16**)

mp = 144–146 ◦C; 1H-NMR (CDCl3) δ 7.68 (d, *J* = 15.5 Hz, 2H), 7.11 (dd, *J* = 8.3, 1.5 Hz, 2H), 7.01 (s, 2H), 6.91 (d, *J* = 8.2 Hz, 2H), 6.65 (d, *J* = 15.5 Hz, 2H), 6.01 (s, 2H), 3.93 (s, 6H), 2.07–2.03 (m, 4H), 1.37–1.33 (m, 4H), 1.10–1.03 (m, 4H), 0.90 (t, *J* = 7.3 Hz, 6H); 13C-NMR (CDCl3) δ 198.0, 148.5, 146.8, 144.0, 126.9, 124.1, 119.5, 114.7, 109.7, 68.3, 56.1, 29.1, 25.5, 23.2, 13.9; HRMS [ESI]<sup>+</sup> calculated for C29H36NaO6: 503.2410 [M + Na]+; found: 503.2400.
