| http://www.w3.org/ns/prov#value | - In the formula 3, each of R3, R4, R5 and R6 which are independent of one another, is a methyl group, an ethyl group or an n-propyl group, provided that two selected from R3 to R6 may be bonded with each other to form a tetramethylene group; in the formula 4, each of R7 and R8 which are independent of each other, is a C1-3 alkyl group and R9 is a hydrogen atom or a methyl group; and in the formula
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