| http://www.w3.org/ns/prov#value | - Preferred compounds of the formula I are those in which R1, R2 and R3 independently of one another are hydrogen, C1 -C6 -alkyl or C1 -C2 -hydroxyalkyl and R3 is additionally phenyl, benzyl, C8 -C22 -alkylbenzyl, monochlorobenzyl, dichlorobenzyl, mononitrobenzyl, dinitrobenzyl or trimethoxysilylpropyl, and R4 is a radical of the formula II in which R6 is hydrogen or methyl and v is a number from 2
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