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US4219649A Pyrido[1,2-a]pyrimidine derivatives 失效
吡啶并[1,2-a]嘧啶衍生物

Pyrido[1,2-a]pyrimidine derivatives
Abstract:
Compounds of the formula: ##STR1## or pharmaceutically acceptable acid addition or quaternary ammonium salts thereofwhereinR.sup.2 is C.sub.1 to C.sub.6 alkyl:R.sup.3 is C.sub.1 to C.sub.6 alkyl;R.sup.4 is a single electron pair, hydrogen or lower alkyl; and the dotted lines indicate saturated or unsaturated bonds, are disclosed with analgesic properties.
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