prov:value
| - X is preferably a halogen, such as chloro or bromo; a hydrocarbon, especially a saturated or unsaturated aliphatic hydrocarbon having 1-18 carbon atoms which may or may not have a side chain, for example ethyl, isopropyl, n-propyl, t-butyl, hexyl, octyl, 2-ethylhexyl, nonyl, decyl, lauryl, stearyl and oleyl; an alkoxy, especially saturated or unsaturated an alkoxy group having 1-18 carbon atoms, f
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