66 (m, lH), 4.40-4.34(m,1H).(Z)-3:6=6.33(dd,J=6.2,1.7Hz,lH),6.11(dd,J=11.7, 7.3 Hz, 1H). 5.22 ( t m , J = 8.1 Hz, 1H). 5.16 (dd, 5=11.2 Hz. l H , CH=CHC(O), Nebendiastereomer), 5.09 (dd, J = 11.8, 2.0 Hz, 1 H. CH=CHC(O). Hauptdidstereomer),4.78(td,J=10.7,4.4Hz, lH),4.73-4.68(m,IH).