| http://www.w3.org/ns/prov#value | - 2 and X are each as defined above; and c is 2 or 3. [0025] Particular examples of R1 and R2 in the general formula (1) include alkyl groups (for example, methyl group, ethyl group), cycloalkyl groups (for example, cyclohexyl group), aryl groups (for example, phenyl group), aralkyl groups (for example, benzyl group) and triorganosiloxy group represented by (R???)3SiO??? wherein R??? is, for example
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