“…7000),293.4 (2630); IR vm.icm'l 3400, 1608, 1510; IH NMR (CDCI) S/ppm 7.31 (2H, d, J = 8.7 Hz, H-2 and H-6), 6.87 (2H, d, J =8.7 Hz, H-3 and H-5), 6.55 (lH, d, J =15.9Hz, H-7),6.22 (lH, dt, J =15.9,5.6 Hz,, 5.49 OH, t, J = 6 6. Hz, H-2'), 4.51 (2H, d, J= 6.6 Hz, 4.29 (2H, d, …”