Use the ^13C NMR spectrum to confirm the structure. Identify the number of unique carbon environments and the carbon signals. Correlate the carbon signals with the proton signals to confirm the assignments.
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2-hydroxy-3-(3-phenyl-propenyl)-[1,4]naphthoquinone
1H-Imidazole, 2-ethyl-4,5-dihydro-4,5-diphenyl-, (4R,5R)-
Glycine, N-(5,5-dimethyl-3-oxo-1-cyclohexen-1-yl)-, methyl ester
