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. 2017 Jan 5;7:39900. doi: 10.1038/srep39900

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(a) Chromatographic profiles for 14- (upper panel) and 12-carbon long (lower panel) metabolites. (b) High resolution MS (insert) and MS/MS spectral data and (c) Triple quadrupole MS/MS analysis for H1 in rat urine. (d) High resolution fragmentation analysis for urinary H2.