| 摘要 |
Pyridinium derivatives having the formula: <IMAGE> in which X is O or S; R is benzoyl optionally substituted with at least halogen or lower alkyl, lower alkoxy, hydroxy or nitro; R1 is hydrogen, halogen, hydroxy or lower alkyl, R2 is hydrogen or halogen and n is from 1 to 2, and in which R1 may be different in each CHR1 when n is 2.
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