| http://www.w3.org/ns/prov#value | - R1 to R8 represent substitutional possibilities at each position and each represents hydrogen or hydrocarbon groups or functional groups such as cyano, nitro, halogen, haloalkyl, haloalkoxy, alkoxyl, amido, amino, sulfonyl, carbonyl, carbonyloxy and oxycarbonyl etc., with the provision that R1 and R2 together, R3 and R4 together, R5 and R6 together, R7 and R8 together can form a fused benzo ring;
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