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- 3 The COSY NMR spectrum of 2-methyl-3-pentanone is shown below. Draw the structure of 2-methyl-3-pentanone and number the proton environments sequentially Cut and paste the COSY spectrum or download the image and save it as a picture file Label each signal in the COSY spectrum according to which proton environment it relates to in the structure of the molecule.interpret the proton NMR spectrum shownGiven this molecule, how would I be able to identify it via an HNMR spectrum? What would the NMR spectrum look like?