| http://www.w3.org/ns/prov#value | - ke, alkali and alkaline-earth metals either pure or alloyed with other metals such as silver; and organic compounds and polymers such as: 7,7,8,8-tetracyanoquinodimethane, 1,2,4,5-tetracyanobenzene, 4-(n-butoxycarbonyl-9-fluorenylidene) malonitrile , 4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl) 4H-pyran, 4,4'-diphenoquinone, 2,6-bis(phenyl)benzo[1,2-d: 4,5-d']dioxazole, 2,6-bis-(phenyl)
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