| http://www.w3.org/ns/prov#value | - Y represents the atoms necessary to complete an aryl (preferably phenyl or naphthyl) ring which is ortho-nitro-substituted and preferably is also para-substituted with a nitro or other electron-withdrawing group and which can have other substituents attached to it and other carbocyclic rings fused to it (e.g., 2-nitrophenyl, 2,4-dinitrophenyl, 2,6-dinitrophenyl, 2,4,6-trinitrophenyl, 2-nitronaphth
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