| http://www.w3.org/ns/prov#value | - wherein, X is a halogen atom such as --Cl and --Br, or a leaving group such as mesyloxy (--OMs) and tosyloxy (--OTs); Y is --NH.sub.2, primary or secondary amine, --N.sub.3, or --CN; and R is hydrogen, halogen, alkyl, hydroxy, amine, --NO.sub.2
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