prov:value
| - In the formulae, R is an organic radical selected from alkyl having 1 to 10 carbon atoms, preferably alkyl having 1 to 6 carbon atoms, alkenyl having 2 to 6 carbon atoms, preferably allyl, aryl, preferably phenyl, and acyloxy, preferably maleoyl and acetyl; and X is hydrogen or halogen including fluorine, chlorine, bromine and iodine.
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