A molecule of unknown structure has a molecular formula of C9H8O2. In the infrared spectrum there are absorptions at 1761, 1145, and 761 cm–1. In the 13C NMR spectrum, there are absorptions at ? 168.4, 152.0, 128.2, 128.0, 124.3, 122.8, 116.8, 29.1 and 23.6. In the 1H NMR spectrum, between ? 7.2 and 7.0, there is a complicated pattern that integrates to 4 protons. Additionally, there are triplets at ? 3.0 and 2.7, each integrating to 2 protons. Identify the structure of the unknown.