| http://www.w3.org/ns/prov#value | - C.sub.16 alkyl amino, alkoxy of 1-6 carbon atoms, di-lower C.sub.2-12 alkyl amino, nitro, azido, sulfhydryl, cyano, isocynato, halogen, amido, sulfonato or carbamido; wherein at least one of X.sup.1, X.sup.2, X.sup.3, and X.sup.4 is other than hydrogen;
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