“…More polar product: (Z) 5,6, 3.82 (1H,dd,J¼11.5,3.8 Hz,m,3.84 (1H,d,J¼3.2 Hz,m,3.89 (1H,dd,J¼11.5,2.1 Hz,4.34 (1H,ddd,J¼9.7,3.5,2. 5.19 (1H, s, H-2) and 7. m,4£Ph); d H (400 MHz, C 6 D 6 ) 3.56 (3H, s, CO 2 Me), 3.83 (1H, dd, J¼11.8, 3.6 Hz, H-8 a ), 3.86 (1H,d,J¼3.6 Hz,3.93 (1H,d,J¼11.8,1.9 Hz, ), 3.96 (1H,dd,J¼5.7,3.6 Hz,4.10 (1H,dd,J¼10.2,5.7 Hz, 9,68.3,71.4,72.7,73.4,73.6,77.4,77.7,82.7,99.4 (CvCH),127.4,127.7,127.8,127.9,128.3,128.4,128.5,, 137.6 (C-ipso), 137.8 (C-ipso), 138.4 (C-ipso), 161.9 (CvCH) and 165.1 (CvO); m/z (FAB) M þ þNa 617.2540 [C 37 H 38 O 7 Na requires 617.2515].…”