| 摘要 |
IMPROVEMENTS IN OR RELATING TO ORGANIC COMPOUNDS This invention provides new compounds of formula I, I wherein R1 and R2 are independently hydrogen halogen, trifluoromethyl, lower alkoxy or lower alkyl, R3 is hydrogen, lower alkyl, lower hydroxy alkyl, or phenyalkyl of 7 to 10 carbon atoms, wherein the phenyl ring is unsubstituted or mono-substituted or independently di-substituted, by halogen, lower alkyl t lower alkoxy, amino, lower alkylamino or di(lower alkyl)amino, and R4 is hydrogen, lower alkyl or lower hydroxy alkyl, useful as anti-arrhythmics and anti-depressants.
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