Propose a structure consistent with the following spectral data for a compound C12H18OS, IR: 2100 cm...

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Propose a structure consistent with the following spectral data for a compound C12H18OS, IR: "2100 cm (weak); 1745 cm; 1715 cm; 'H NMR: 1.06 6 (3H, triplet); 1.27 5 (6H, doublet); 1.74 6 (2H, multiplet); 2.40 6 (2H, triplet); 2.45 6 (2H, quartet); 2.46 6 (2H, triplet); 5.09 6 (1H, septet). "C NMR: 7.9, 18.0, 20.7, 22.4, 35.9, 41.1, 68.3, 74.9, 90.5, 153.9, 210.8 (15 points). Propose a structure consistent with the following spectral data for a compound C12H18OS, IR: "2100 cm (weak); 1745 cm; 1715 cm; 'H NMR: 1.06 6 (3H, triplet); 1.27 5 (6H, doublet); 1.74 6 (2H, multiplet); 2.40 6 (2H, triplet); 2.45 6 (2H, quartet); 2.46 6 (2H, triplet); 5.09 6 (1H, septet). "C NMR: 7.9, 18.0, 20.7, 22.4, 35.9, 41.1, 68.3, 74.9, 90.5, 153.9, 210.8 (15 points).