| 摘要 |
Compounds of the formula <IMAGE> in which R1 denotes hydrogen, C1-8-alkyl, R2 denotes hydrogen, C1-22-alkylcarbonyl, phenyl-C1-4-alkylcarbonyl, cyclohexylcarbonyl, phenylcarbonyl which is unsubstituted or substituted by 1 or 2 C1-12-alkyl together having at most 18 C atoms or denotes a radical of the formula <IMAGE> R3 has one of the meanings of R2 or denotes a radical of the formula <IMAGE> in which R3 is hydrogen only if R2 denotes hydrogen, R4 denotes C1-18-alkyl, which may carry an -N=C=O- group, cyclohexyl, benzyl, phenyl, C1-12-alkylphenyl, R5 denotes C1-20-alkylene or phenylene, R6 denotes a radical of the formulae <IMAGE> R7 denotes hydrogen, C1-18-alkyl, beta -hydroxyethyl, R8 denotes C1-18-alkyl, beta -hydroxyethyl, phenyl or R7 and R8 together with the N atom to which they are bound denote a morpholine or piperidine radical.
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