| http://www.w3.org/ns/prov#value | - As the aromatic aldehyde compound having a phenolic hydroxyl group, the compounds represented by the following general formula (V), for example, hydroxybenzaldehyde, methoxy hydroxybenzaldehyde, dimethoxy hydroxybenzaldehyde, salicylaldehyde, etc. may be cited. wherein Y represents an alkyl group or an alkoxy group each having 1 to 18 carbon atoms, and k is an integer of 0, 1, or 2.
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