| http://www.w3.org/ns/prov#value | - R1, R2, R3, R4, R5, R6, R7, R8, R9, R10 and X2 are alkyl, cyclic alkyl, aryl, alkaryl, more especially methyl, ethyl, 1-methylethyl, 1,1-dimethylethyl, cyclohexyl, phenyl, 2,6-dialkylphenyl, benzyl, trimethylsilyl and benzyl(dimethyl)silyl, t-butyl(dimethyl)silyl, n-butyl(dimethyl)silyl; and
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