“…NMR spectra (400 MHz) were measured using a Bruker AM-400, and TMS as internal standard. E-Lychnophoric acid (1), used as a raw material, was obtained as previously described [12]. IR (KBr, cm -1 ) ν: 2400-2300, 2900, 2800, 1680, 1600, 1400, 1255 and 855; 1 H NMR (400 MHz, CDCl 3 ) δ H : 6.99 (t, J=7.9 Hz, H-5), 4.92 (d, J=0.9 Hz, H-14a), 4.80 (d, J=0.9 Hz, H-14b), 2.50 (dd, J=9.5 and 2.7 Hz, H-7a), 2.47 (dd, J=3.9 and 2.7 Hz, H-3a), 2.45 (ddd, J=5.4, 1.3 and 0.7 Hz, H-9), 2.42 (ddd, J=9.5, 2.0 and 1.3 Hz, H-7b), 2.36 (d, J=2.7 Hz, H-3b), 2.33 (ddd, J=5.4, 1.3 and 0.9 Hz, H-1), 2.27 (dd, J=7.9 and 2.0 Hz, H-6a), 1.80 (ddd, J=7.9 and 2.7 and 1.3 Hz, H-6b), 1.73 (dd, J=9.5 and 1.3 Hz, H-10a), 1.65 (ddd, J=15.5, 2.7 and 1.3 Hz, H-2a), 1.55 (dd, J=9.5 and 0.7 Hz, H-10b), 1.45 (ddd, J=15.5, 3.9 and 0.9 Hz, H-2b), 1.00 (s, H-13) and 0.98 (s, H-12); 13 E-Lychnophoric acid methyl ester 2 was obtained by the esterification of acid 1 with an acetic anhydride/pyridine mixture [13].…”