| http://www.w3.org/ns/prov#value | - nally (CH2)n --COR14, in which n is 0, 1 or 2, R14 is hydroxyl, ##EQU4## C1 -C18 alkoxy or ##STR71## R15 and R16, independently of one another, are hydrogen or C1 -C18 alkyl, M is an r-valent metal cation and r is 1, 2 or 3, R7, R8, R9 and R10, independently of one another, are hydrogen, C1 -C4 alkyl or C1 -C4 alkoxy, with the proviso that at least one of the radicals R7, R8, R9 and R10 is hydroge
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