“…MS: m / z /(MH+) 369. 1H NMR: δ 7.83 (d, 1H, H-C [ 23 ]), 7.22 (s, 1H, H-C [ 21 ]), 6.25 (d, 1H, H-C [ 22 ]), 5.68 (m, 1H, H-C [ 3 ]) 5.34 (d, 1H, H-C [ 4 ]) 0.94 (s, 3H, CH3 [ 19 ]) 0.71 (s, 3H, CH3 [ 18 ]). 13C NMR: δ 16.71 (C18), 21.83 (C19), 83.93 (C14), 51.47 (C17), 127.46 (C20), 148.62 (C21), 146.94 (C22), 115.46 (C23), and 162.54 (C24).…”