prov:value
| - biphenyl, or indenyl group at least one substituent of said aryl group being an ether group R6 --O-- in which R6 represents an organic group e.g. an alkyl group including a substituted alkyl group, e.g. a methyl, ethyl, propyl, hexyl, dodecyl, or octadecyl group, a cycloalkyl group including a substituted cycloalkyl group e.g. a cyclopentyl, cyclohexyl, or methylcyclohexyl group, an aralkyl group
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