prov:value
| - carbon atoms, R2 is a hydrogen atom, an alkyl or alkoxy group having 1 to 4 carbon atoms, an aryl group, an aryloxy group, a thioether group, an amino group, a halogen atom, an aldehyde group, a cyano group, a nitro group or a hydroxyl group and x is an integer of 1 to 6, on the condition that, if x is an integer of 2 to 6, R2 may be the same or diferent, and n is an integer not less than 2.
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