| http://www.w3.org/ns/prov#value | - C. compounds of the formula ##STR7## wherein R5 and R6 independently of the other represent alkyl with 1 to 4 carbon atoms or benzyl, X2 represents methyl, alkoxy with 1 to 4 carbon atoms, or alkanoyloxy with 2 to 4 carbon atoms, Z2 represents methyl or phenyl and U2 represents alkyl having 3 to 8 carbon atoms especially having 7 or 8 carbon atoms.
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