| 摘要 |
Compounds of the general formula: <IMAGE> wherein R1 represents hydrogen, chlorine or methoxy, R2 represents hydrogen, methyl or benzyl, and R3 and R4 represent hydrogen, or R3 represents methyl and R4 represents hydrogen, or R3 represents hydrogen and R4 represents methyl, with the exception of those compounds wherein R1, R3 and R4 each represent a hydrogen atom simultaneously, are new therapeutically useful compounds; they possess an antianoxic activity.
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