“…The solvent was removed under reduced pressure using a rotatory evaporator and the crude product was purified by silica-gel column chromatography using ethyl acetate/hexane mixture as the eluent. 9, 167.8, 142.3, 142.2, 139.0, 134.9, 132.2, 131.2, 128.8, 128.6, 122.2, 115.4, 114.0, 104.1, 61.9, 14.4 8, 167.6, 158.6, 141.1, 132.9, 131.9, 131.6, 131.0, 130.6, 129.3, 122.7, 121.8, 118.9, 106.6, 62.0, 14.5 9, 168.3, 142.3, 142.1, 139.0, 135.1, 132.3, 131.3, 128.9, 128.7, 122.2, 115.2, 114.1, 104.3, 52.8 8, 168.1, 158.5, 141.2, 133.1, 131.9, 131.7, 131.0, 130.6, 129.3, 122.8, 121.8, 118.5, 106.7, 52.9 9, 167.3, 142.3, 139.1, 134.8, 132.2, 131.1, 128.8, 128.6, 122.2, 115.9, 114.0, 104.1, 69.6, 22 8, 167.2, 158.6, 141.1, 132.8, 132.0, 131.6, 131.0, 130.6, 129.3, 122.7, 121.8, 119.3, 106.5, 69.6, 22.2 167.9, 142.4, 142.2, 139.1, 134.9, 132.2, 131.3, 128.8, 128.7, 122.2, 115.6, 114.1, 104.2, 65.8, 30.8, 19.5, 13.9 8, 167.7, 158.5, 141.2, 132.9, 131.9, 131.6, 131.0, 130.6, 129.3, 122.7, 121.8, 118.8, 106.6, 65.8, 30.8, 19.5, 13.9 9, 166.8, 141.5, 141.4, 138.9, 137.7, 134.7, 131.4, 128.9, 128.7, 116.8, 115.8, 114.4, 104.8, 62.4, 14.5 8, 166.5, 157.9, 140.4, 135.7, 134.2, 131.6, 131.2, 130.5, 129.5, 122.9, 120.0, 115.1, 107.3, 62.4, 14.5 .39 (dd, J = 8.9, 2.5 Hz, 1H), 6.87 (d, J = 9.0 Hz, 1H), 4.63 (q, J = 7.1 Hz, 2H), 1.46 (t, J = 7.1, 3H); 13 C-NMR (100 MHz, CDCl 3 ) δ 188. 9, 166.8, 141.6, 141.0, 138.9, 134.8, 131.8, 131.4, 128.9, 128.7, 127.3, 116.4, 115.5, 104.7, 62.4, 14.4 8, 166.6, 158.0, 139.9, 132.9, 131.6, 131.2, 130.6, 129.5, 127.9, 122.8, 119.8, 107.1, 62.4, 14.5 3, 141.8, 140.7, 138.1, 134.6, 133.3, 131.5, 128.7, 128.6, 123.5, 115.7, 114.9, 105.1, 101. 1, 136.44, 136.41, 135.7, 131.6, 128.7, 128.6, 127.0, 122.3, 115.9, 106.6 6, 140.7, 138.2, 137.4, 135.5, 134.1, 132.8, 131.5, 128.7, 128.6, 126.7, 115.9, 105.9, 20.4 5,154.6,141.0,138.3,135.9,131.5,130.3,128.6,128.5,125.0,…”