| http://www.w3.org/ns/prov#value | - Each R1, R2, and R3 can also be an arylene group (e.g., 1,4-phenylene) or an arylene group substituted by functional groups such as lower alkyl groups, lower alkoxy groups, and halogens (preferably, by functional groups that do not contain hydrogen atoms capable of hydrogen bonding, such as lower alkyl or alkoxy groups).
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