| http://www.w3.org/ns/prov#value | - There are also examples of N-??????allyl, N-??????propargyl and N-??????cycloalkyl substituents.The anti-??????depressant drug bupro??pion has a tertiary-??????butyl group on the nitrogen atom and several other sub??stances invest??ig??ated for their poten??tial as smoking ces??sa??tion drugs also have a bulky alkyl group on the nitrogen atom, e.g. tertiary-??????butyl, iso-??????propyl or cyc??lo
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