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NMR evidence for the existence of two Dhb residues in paenibacillin. The expansions of NMR spectra show the unique quartet peaks of Hβ at ∼6.7 ppm in one-dimensional 1H-NMR spectroscopy (top) and the through-bond cross-peaks between Hβ and Hγ (∼1.80 ppm) (left) in the TOCSY experiment (middle).
