| http://www.w3.org/ns/prov#value | - 8 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 hydrogen, R11 and R12, independently of one another, are hydrogen, C1 -C4 alkyl or phenyl, and, in the case where R3, R5, R6, R7 and R10 are hydrogen, R4 is additionally a r
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