| http://www.w3.org/ns/prov#value | - M is an alkali metal and M1 is an alkaline earth metal; R4 and R13 independently of one another are C1-C12alkyl, C1-C12haloalkyl, C1-C12hydroxyalkyl, C3-C8cycloalkyl, C6-C12aryl or C7-C12aralkyl; R5 and R10 independently of one another are hydrogen, C1-C6alkyl, phenyl or benzyl, where the alkyl groups in their turn are unsubstituted or substituted by C1-C6alkoxy or C3-C6cycloalkyl; R6, R7 and R8
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