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US07767824B2 Heterocyclic compounds and cerebral function improvers containing the same as the active ingredient 有权
含有与活性成分相同的杂环化合物和脑功能改善剂

Heterocyclic compounds and cerebral function improvers containing the same as the active ingredient
Abstract:
Heterocyclic compound represented by the formula I wherein represents or the like; R1 represents hydrogen atom, C1-C6 alkyl or benzyloxy; R2 represents methyl or nil; R3 represents hydrogen atom, C1-C6 alkyl, C2-C6 alkenyl, C3-C8 cycloalkyl or —CH2R5 [wherein R5 represents phenyl (which may be substituted with C1-C6 alkyl, halogen atom or cyano)] or thienyl; R4 represents C1-C6 alkyl, C2-C6 alkenyl, C3-C8 cycloalkyl or —CH2R6 [wherein R6 represents phenyl (which may be substituted with C1-C6alkyl, halogen atom or cyano), naphtyl or thienyl]; or R3 is coupled with R4.
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