| 摘要 |
1. A compound of the formula see diagramm : EP0110820,P13,F1 wherein R and R**1 are each independently of the other hydrogen, alkyl of 1 to 18 carbon atoms, cycloalkyl of 5 or 6 carbon atoms, phenyl or phenyl substituted by alkyl of 1 to 18 carbon atoms ; A is alkylene of 1 to 6 carbon atoms or cycloalkylene of 5 to 6 carbon atoms ; X is a direct bond or alkylidene of 1 to 12 carbon atoms ; and R**2 is hydrogen, alkyl of 1 to 12 carbon atoms or the group see diagramm : EP0110820,P13,F2 |
