| http://www.w3.org/ns/prov#value | - has the following formula (VI): ##STR5## wherein J is an oxygen atom, asulfur atom or a sulfonyl group; k is an integer of 0 to 4; l is 0 or 1; when k is 2 or more, R.sub.8 may be the same or different; R.sub.7 is a straight-chain or branched alkylene group of 1 to 20 carbon atoms which may be substituted by an aryl group;R.sub.8 represents a monovalent group, such as a hydrogen atom, a halogen at
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