Time for nuclei to return to equilibrium after perturbation in NMR.
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3,3'-(1,3-butadiyne-1,4-diyl)bis<2-(phenylmethoxy)pyridine>
2-Propenoic acid, 3-[3-(chloromethyl)phenyl]-, methyl ester
4-n-butoxybenzylidene-4'-chloroaniline