| http://www.w3.org/ns/prov#value | - formula (2a) ##STR17## wherein R1 represents hydrogen, halogen such as chlorine or bromine and C1 -C3 -alkyl andX represents a C1 -C5 alkylene- or alkylidene radical, a C3 -C6 cycloalkylene or cycloalkylidene radical, a single bond, --S-- or a radical of the formula (2b), ##STR18## in which the two alkyl-substituents can have o-, m- or -position to each other, or represents a radical of the formul
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