| http://www.w3.org/ns/prov#value | - R6 is a hydrogen atom or a substituent, n is 1 or 2, and R1 is a substituents when n is 1, while R1 is a divalent connecting group when n is 2.Next, general formula (R) will be detailed from another view point.In the formula (R), n is preferably 1 or 2; when n is 1, R1 is a naphthyl group, a phenanthryl group, an anthryl group, a 5,6,7,8-tetrahydro-2-naphthyl group, a 5,6,7,8-tetrahydro-1-naphthyl
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