The selective broadening of I3C NMR lines in solutions of piroxicam in polar solvents is related to the equilibrium with its zwitterion by reference to the CP/MAS spectra of the known crystalline solids. The amount of zwitterion in N,N-dimethylformamide solution at 205 K., in which the interconversion is slow enough to allow the separate spectra to be assigned, is 19%.
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