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(a) A 2D 1H-15N HSQC NMR spectrum (with annotations) of a mixture of 62 metabolite standards tagged with 15N-ethanolamine and acquired at 800 MHz within 40 min. The identified metabolites correspond to the numbered entries in Table 1. (b) 1D 1H NMR spectrum of a mixture of 62 metabolite standards acquired at 800 MHz with a pre-SAT180 pulse sequence before tagging.
