... Hz),3.79 (t, J ¼ 2. 20 Hz), 4.19 (t, J ¼ 2. 20 Hz), 5.35 (d, J ¼6 .22 Hz), 7. 82 (d , J ¼ 6 .22 Hz). The spectrum is partiallyobscured by two signals of residual methanol at d 3.3 and4. 6–5 .1. There are ... observable in the spectrumwith m/z 178.3 and 22 2.3. The former ion showed fragmentpeaks with m/z 161.3, 149 .2 and 135 .2, the latter providedpeaks with m/z 20 5 .2, 193 .2 and 176 .2 in the respectiveMS/MS ... in the 13C-NMR spectrum: d (p.p.m.) 17.0, 25 .1, 29 .1, 37.9, 62. 5, 72. 1, 74.3, 82. 7, 123 .0, 131 .2 and 159.8. The corres-ponding1H-NMR spectrum contained various signals in the region 2. 0–4 .5...