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33. Propose a structure for Compound X, which has M -120 and (M+2)-122 of approximately equal intensity in its mass spectrum and has the following C NMR spectral data: (5 points) Broadband decoupled C NMR: 32.6, 118.8, 134.3 ppm DEPT-90: 134.3 ppm DEPT-135: positive peaks at 134.3 ppm; negative peaks at 32.6, 118.8 ppm
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