| http://www.w3.org/ns/prov#value | - (1) units represented by the following formula (1) ##STR9## wherein R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11 and R12, independently from each other, represent a hydrogen atom, a halogen atom or an alkyl group having 1 to 20 carbon atoms, R9 may be bonded to R11 or R12 to form a 3- to 6-membered ring, R10 may be bonded to R11 or R12 to form a 3- to 6-membered ring, n is a positive integer, and
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