1. Hz, 62 (d, J = 1.7 Hz, 3H) 13 C NMR (100 MHz, CDCl3) ? (ppm) 156.6 (d, J = 249, p.28

1. Hz, 1.48 (t, J = 7.0 Hz, 3H) 13 C NMR (100 MHz, CDCl3) ? (ppm) 158.9, 156.5 (d, J = 250, pp.4-12

2. Hz and J. =. , 39 (s, 3H) 13 C NMR (100 MHz, CDCl3) ? (ppm) 152.5 (d, J = 249.3 Hz), 2H), 3.18 (t, J = 4.9 Hz, 4H), pp.7-13

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