3.6.2. (*R*)-PGME Amide of **7** (**7**-18*R*)

Brown amorphous solid; 1H NMR (CD3OD, 800 MHz) δ<sup>H</sup> 7.361–7.318 (5 H, m, PGME-Ar), 5.466 (1H, s, PGME-H-1), 5.126 (1H, dq, *J* = 8.6, 1.1 Hz, H-12), 4.763 (1H, td, *J* = 9.1, 4.2 Hz, H-11), 4.253 (1H, t, *J* = 5.1 Hz, H-4), 3.933 (1H, dd, *J* = 4.6, 1.6 Hz, H-8), 3.697 (3H, s, PGME-OMe), 2.603 (1H, m, H-2α), 2.587 (1H, d, *J* = 17.6 Hz H-7α), 2.460 (1H, m, H-17), 2.393 (1H, dd, *J* = 13.7, 9.4 Hz, H-10α), 2.284 (1H, ddd, *J* = 16.9, 6.9, 4.9 Hz, H-2β), 2.224 (1H, dd, *J* = 18.0, 4.7 Hz, H-7β), 2.151 (1H, m, H-3α), 2.044 (1H, dd, *J* = 13.7, 4.1 Hz, H-10β), 1.957 (1H, m, H-3β), 1.918 (2H, m, H-14), 1.576 (3H, d, *J* = 1.2 Hz, H-20), 1.532 (1H, m, H-16α), 1.345 (3H, s, H-19), 1.321 (1H, m, H-16β), 1.288 (2H, m, H-15), 1.108 (3H, d, *J* = 6.9 Hz, H-21); LRESIMS *m*/*z* 526.3 [M + H]+.
