| http://www.w3.org/ns/prov#value | - ms; R5, R6, and R7 are independently selected from the group consisting of hydrogen, nitro, alkyl and alkoxy of 1 to 30 carbon atoms, aryl and aryloxy of 6 to 14 carbon atoms; R4 and R8 are independently selected from the group consisting of hydrogen, nitro, and linear alkyl and alkoxy of 1 to 14 carbon atoms, with the proviso that if either R4 or R8 is a substituent of more than 2 carbon atoms th
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