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Complete proton and carbon nuclear magnetic resonance spectral assignments of some morphinan-6-one alkaloids by two-dimensional NMR techniques
Gary W. Caldwell, A. Diane Gauthier, John E. Mills and Michael N. Greco
Magnetic Resonance in Chemistry
Volume 31, Issue 3, March 1993, Pages: 309–317,
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http://dx.doi.org/10.1002/mrc.1260310318