| http://www.w3.org/ns/prov#value | - Methyl or propyl group is especially preferable.The unsubstituted aryl groups are preferably those with 6 to 20 carbons, and for example include phenyl, naphthyl groups and the like.The groups capable of being substituted to the above alkyl or aryl group include alkyl groups (e.g., methyl, n-propyl, t-amyl, t-octyl, n-nonyl, dodecyl groups, etc.), aryl groups (e.g., phenyl group, etc.), nitro, hyd
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