prov:value
| - In formula (I) , the aryl group represented by R1, R2, R3, R4 and R5 is an aryl group having from 6 to 20, preferably from 6 to 14, and particularly preferably from 6 to 10, carbon atoms, e.g., phenyl, 1-naphthyl, 2-naphthyl and 2-phenanthryl can be exemplified.
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