| 摘要 |
The invention pertains to theophylline (1-methyl, 3-methyl xanthine) and IBMX (1-methyl, 3-isobutyl xanthine) derivatives of formulas I and II: where R<SUB>1 </SUB>is -CH<SUB>3 </SUB>or -CH<SUB>2</SUB>CH(CH<SUB>3</SUB>)<SUB>2</SUB>, and R<SUB>2 </SUB>is where R<SUB>3 </SUB>and R<SUB>4 </SUB>are independently selected from the group consisting of OCH<SUB>3</SUB>, CH<SUB>3</SUB>, NO<SUB>2</SUB>, F, Cl, Br and I.
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