prov:value
| - A compound as defined by either of claim 1 or 2, wherein and at least one of R2, R3, R4, R7, R12, R13 is an alkyl radical substituent having from 1 to 12 carbon atoms and selected from the group consisting of methyl, ethyl, isopropyl, butyl, tert-butyl, hexyl, octyl, decyl and dodecyl radicals.
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