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Nitrogen bridgehead compounds. Part 69. Studies on quinolizine derivatives. Part 3. Infrared and 1H NMR spectroscopic studies of quinolizine derivatives and their monocyclic tautomers
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Nitrogen bridgehead compounds. Part 70. Studies on quinolizine derivatives. Part 4. Ultraviolet-visible spectra and chemical properties of some quinolizine derivatives and their monocyclic