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- [3] C-13 NUCLEAR MAGNETIC-RESONANCE SPECTRA OF MORPHINE ALKALOIDS JOURNAL OF ORGANIC CHEMISTRY, 1976, 41 (06): : 996 - 1001
- [5] C-13 NUCLEAR MAGNETIC-RESONANCE SPECTRA OF CINCHONA ALKALOIDS JOURNAL OF ORGANIC CHEMISTRY, 1974, 39 (16): : 2413 - 2416