| http://www.w3.org/ns/prov#value | - Formula (1) In the formu-La ( 1 ) , R 1 and R 2 represent an alkyl group or an aryl group, provided that at L east one of R 1 and R 2 contains a fluorine at om and R 1 and R 2 are not an alkyl group containing a group repre sented by - (CX2) n ~X in which X is a halogen atom i n and n is an integer of 7 or more.
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