| http://www.w3.org/ns/prov#value | - H2)m --CH???CH--R with m being an integer of from 0 to 5, or R4 is a radical of the formula ##STR4## wherein R5 and R6, which may be the same or different, are radicals selected from the group consisting of hydrogen, fluorine or chlorine atoms, phenyl, lower alkyl, lower alkoxy, C1-4 acylamino groups or optionally modified carboxy or sulfo groups, two vicinal radicals R5 and R6, when taken togethe
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