An organic compound having molecular formula $C_9H_{10}O_2$ exhibits the following spectral characteristics:
$'H NMR: \delta 9.72 (t, 1H), 7.1 (d, 2H), 6.7 (d, 2H), 3.8 (s, 3H), 3.6 (d, 2H)$
$IR: ~1720 cm^{-1}$
The most probable structure of the compound is