Identify the compound with the mass spectrum and proton NMR spectrum shown in Fig. P19.67. This compound has IR absorptions at 1678 cm^–1 and 1600 cm^–1.

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100 183 185 155 60 40 1157 43 198 200 La fl 0 10 20 30 40 50 60 70 150 160 170 180 190 200 80 90 100 110 120 130 140 mass-to-charge ratio m/z