| http://www.w3.org/ns/prov#value | - roup, an aryl group, an allyl group, an aralkyl group, an alkenyl group, an alkynyl group, silyl group, an alicyclic group, a substituted alkyl group, a substituted aryl group, a substituted allyl group, a substituted aralkyl group, a substituted alkenyl group, a substituted alkynyl group or a substituted silyl group, with the proviso that at least one of R5, R6, R7 and R8 is an alkyl group having
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