| 摘要 |
Compounds of formula WHEREIN R1 and R2 independently of one another denote optionally substituted alkyl radicals with 1-3 C atoms and R3 represents hydrogen or an optionally substituted alkyl radical with 1-5 C atoms, as well as compounds of the formula WHEREIN R4 represents an alkyl group which is optionally substituted by hydroxyl or alkoxy groups, and R5 and R6 represent hydrogen or an amino group which is monosubstituted or disubstituted by a straight-chain alkyl group or a cycloalkyl group, with the proviso that R5 and R6 do not simultaneously represent hydrogen, and processes for their production.
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