prov:value
| - R7 independently represent hydrogen atom, halogen atom, alkyl group, aryl group, aralkyl group, amino group, styryl group, nitro group, hydroxyl group, carboxyl group, cyano group or aryl azo group, while R1 ' to R7 ' and R1 to R7 independently may form a substituted or an unsubstituted condensed ring; n is 0, 1 or 2; r is an integer of 1 to 8; S represents 0 or 1; and t represents 1 or 2.
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