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Draw the structure for molecular formula C7H8. Proton decoupled C NMR. Signals: 21.3, 125.7, 128.6,129.0 and...

Draw the structure for molecular formula C7H8. Proton decoupled C NMR. Signals: 21.3, 125.7, 128.6,129.0 and 138.4.

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