prov:value
| - It is preferred however that the substituents R1 to R9 and R12 to R14 are hydrogen atoms or unsubstituted hydrocarbyl groups, particularly alkyl groups such as ethyl, propyl, isopropyl, n-butyl, tertiary butyl, isopentyl, hexyl, heptyl, octyl, 2-hexyldecyl, isooctadecyl and 2-octyldodecyl.
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