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Proton one-dimensional Nuclear Magnetic Resonance (NMR) spectra with multipresaturation of water and ethanol signals. From bottom to top: AGR, J210, M16, M17, N16, N17, S16 and S17. The set of assigned resonances within the stacked plots were obtained by a NMR- Multivariate Statistical Analysis preliminary approach, carried out with Mexican wines  and confirmed with respect orthogonal literature related to Port wines .
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