What is the structure?
Molecular formula: C9H12O
1H NMR: 5 signals
6.44 (m), 6.03 (d), 2.74 (m), 1.91 (d), 1.23 (d)
13C NMR: 8 signals
177.8, 151.9, 133.5, 90.5, 77.5, 21.7, 19.9, 12.6
IR: 2963, 2240, 1680, 1618 cm-1
1H NMR: 6.44 (1H), 6.03 (1H), 2.74 (1H), 1.91 (3H), 1.23 (6H)