1H-NMR Spectrum H-NMR Examples 88 1 290 1H-NMR Examples 291 H-2' H-3' Ph-H H-9 H-10 H-5 H-20a H-20b H-13 H-3 H-14a H-14a Aco￾Me-18 Me-19 Me-16 Me-17 1 H-NMR Spectrum O AcO H H OAc HO O 1 3 5 7 9 11 13 15 17 18 19 20 1' 2' 3' 292 O OAc AcO H O H OAc OAc AcO H 13 1 3 5 9 7 20 18 19 293 Connection of the protons O OAc AcO H O H OAc OAc AcO H 13 1 3 5 9 7 20 18 19 1 H- 1 H COSY Long-range 1 H- 1 H COSY 294 O OH O HO OCH3 OCH3 OMe 295 O OH O HO OCH3 OCH3 OMe