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Crabb, T.A.
Nuclear Magnetic Resonance of Alkaloids
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http://dx.doi.org/10.1016/S0066-4103(08)60298-7H. Booth.
Proton magnetic resonance studies of cyclic compounds—iv *1: The influence of alkyl substituents on the chemical shifts of the ring protons in cyclohexane compounds
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http://dx.doi.org/10.1016/0040-4020(66)80030-3H.P. Hamlow, S. Okuda, N. Nakagawa.
NMR effects of cyclic tertiary amines
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http://dx.doi.org/10.1016/S0040-4039(00)70385-6Спасибо!