“…The 1 H NMR data (Table S1) in DMSO of 1 exhibited one oxygen-bearing methylene signal at δ H 3.93 (1H, d, J = 10 Hz, H-10a), δ H 3.81 (1H, d, J = 10 Hz, H-10b), two oxygen-bearing methine signals at δ H 4.06 (1H, d, J = 4.18 Hz, H-7), δ H 4.46 (1H, s, H-8), one singlet aromatic proton at δ H 6.53 (1H, s, H-1), two methylene signals at δ H 2.66 (2H, td, J = 8.0 Hz, H-11), δ H 2.49 (2H, td, J = 8.0 Hz, H-12), one methyl group at δ H 1.46 (3H, s, CH 3 -9), and two methoxys at δ H 3.58 (3H, s, OCH 3 -4), δ H 3.66 (3H, s, OCH 3 -13). The 13 C NMR spectra (Table S2 and Figure The presence of an oxygen-bearing methylene at C-9 was further verified by the HMBC correlations from H-10/C-9; H-10/C-7, C-8. From correlations from CH 3 -9/C-9, it can be inferred that the methyl group is linked at C-9.…”