prov:value
| - The ???aryl??? in R1, R6, R7, R8 and R means an aromatic hydrocarbon having 6-16 carbon atoms and is specifically exemplified by phenyl, naphthyl, biphenyl, anthracenyl, indenyl, azulenyl, fluorenyl, phenanthrenyl, pyrenyl, etc.; preferred is phenyl or naphthyl; and particularly preferred is phenyl.
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