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Magnetic Resonance in Chemistry
Volume 30, Issue 1, pages 1–5, January 1992
E. Charles Angell, David St C. Black, Naresh Kumar
13C NMR study of N-acyl- and N-sulphonyl-isatins and their ring-opened derivative- DOI:
http://dx.doi.org/10.1002/mrc.1260300102