| http://www.w3.org/ns/prov#value | - p consisting of hydrogen, alkyl groups, substituted alkyl groups, alkoxy groups, halogens, CN, a ureido group and NHCOR13 (R13 being hydrogen, an alkyl group, a substituted alkyl group, an aryl group, a substituted aryl group, an aralkyl group or a substituted aralkyl group) T is an alkyl group, W1 is selected from the group consisting of hydrogen, CN, --CONR14 R15, a pyridinium group and a carbox
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