*(1E,6E)-1,7-bis(4-Hydroxy-3-methoxyphenyl)-4,4-dipropylhepta-1,6-diene-3,5-dione* (**15**)

mp = 137–139 ◦C; 1H-NMR (CDCl3) δ 7.69 (d, *J* = 15.0 Hz, 2H), 7.11 (dd, *J* = 8.3, 1.5 Hz, 2H), 7.01 (d, *J* = 1.5 Hz, 2H), 6.91 (d, *J* = 8.0 Hz, 2H), 6.65 (d, *J* = 15.5 Hz, 2H), 5.90 (s, 2H), 3.94 (s, 6H), 2.05–2.01 (m, 4H), 1.15–1.08 (m, 4H), 0.95 (t, *J* = 7.5 Hz, 6H); 13C-NMR (CDCl3) δ 197.9, 148.5, 146.7, 144.0, 126.8, 124.1, 119.5, 114.7, 109.7, 68.4, 56.1, 31.8, 16.8, 14.7; HRMS [ESI]<sup>+</sup> calculated for C27H32NaO6: 475.2097 [M + Na]+; found: 475.2100.
