| http://www.w3.org/ns/prov#value | - ting of halogen, N3, NCS, OCH3, CH3, CH2CH3, NO2, and NH2; or R4 is ???(CH2)n-Z, n is an integer from 0 to about 7, Z is selected from an unsaturated ring having 5 ring atoms and 0 to 4 independently selected heteroatoms as ring members fused to an unsaturated ring having 5 ring atoms and 0 to 4 independently selected heteroatoms as ring members, an unsaturated ring having 5 ring atoms and 0 to 4
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