prov:value
| - and X is O, -C=O, -SO2 or CF3 - C - CF3 groups, and where in formula 3, c is a functional group such as carboxyl group and a, b, d and e are either hydrogen or alkyl group of 1-4 carbon atoms or a combination of hydrogen and alkyl or a functional groups selected from carboxyl and halogen, and wherein in formula 4, a, b, c and d are either hydrogen or an alkyl group of 1-4 carbon atoms or a combina
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