| 摘要 |
<p>Process for the preparation of compounds of the formula I in which R1, R2, R3, R4, R5 and R6 have the meanings indicated in claim 1, which comprises the reaction of a compound of the formula II in which R1, R2, R3, R4 have the meanings indicated above, with a compound of the formula III in which R5, R6 have the meanings indicated above.</p> |
