| http://www.w3.org/ns/prov#value | - and with the further proviso that when n is 1, when [QC+ ] is ##STR1560## wherein R1 is C1 -C7 alkyl or C7 -C10 aralkyl, and when the centrally acting drug of which D is a residue contains only one --NH2 functional group and no other functional groups, then D must be the residue of a centrally acting drug other than a sympathetic stimulant.
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