prov:value
| - group as exemplified for R1 above, 4-t-butylphenyl, 4-t-octylphenyl, 1,3,5-trimethylphenyl, or 2,4-di-t-butylphenyl, 2,4-di-t-pentylphenyl). [0292] R6 is a halogen atom (preferably Cl), a C1-18 alkyl group (e.g., methyl, isopropyl, t-butyl, n-dodecyl), a C1-18 alkoxy group (e.g., methoxy, n-butoxy, n-octyloxy, methoxyethoxy, benzyloxy), a C6-18 aryloxy group (e.g., phenoxy, p-tolyloxy, 4-mehoxyph
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