prov:value
| - , X is a hydrogen atom, a methyl group, a straight-chain or branched-chain alkyl group having 1 to 21 carbon atoms, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a CFX1X2 group in which X1 and X2 are a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom or an iodine atom, a cyano group, a straight-chain or branched-chain fluoroalkyl group having 1 to 20 carbon atoms
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