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The 1H-NMR of cytisine-N-(p-nitrophenylcarbonate) (CNPC) (A) and COSY (B) spectra in CDCl3: The impurities and residual CHCl3 resonances are labeled with asterisks. Relevant cross peaks in the COSY spectrum are labeled with letters. For atom numbering in CNPC, see Scheme 1.
