| http://www.w3.org/ns/prov#value | - or azide group, R14 is equal to or different from R15 and each, independently of the other, is absent or represents from one up to four substituents such as phenyl, alkyl preferably with from about 1 to about 12 carbon atoms, halogen atoms, cyano group, vinyl group, mercapto group, hydroxy group, amine group, aldehyde group, carboxylic acid group, nitrile group, diazo group, nitro group, or azide
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