| http://www.w3.org/ns/prov#value | - RA and RB 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 RA and RB are not connected with each other, except by means of the N linking group;
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