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The 13 C nmr chemical shifts of phenylbutazone, oxyphenbutazone, indomethacin and indole‐3‐acetic acid are reported. The assignments of various carbon resonances are made on the basis of the substitution effects on benzene shifts, multiplicities generated in SFORD spectra, nuclear overhauser enhancement for protonated carbons, and the comparison with analogous compounds.
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Singh et al. (1978) studied this question.
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