| http://www.w3.org/ns/prov#value | - (preferably by Cl, F, NO2 or NH2) or an acyl radical having from 1 to 6 carbons, such as acetyl; and M2 and M3 =M1, COOH, CONH2, COOR3 or CN (preferably X is NH or O); R1 =H, alkyl (preferably C1 to C6 and most preferably C1 to C4), modified alkyl (preferably C1 to C5, the terminal carbon of which is either substituted with NH2, OH, Cl, Br or F or is replaced with CF3 or CF2 CF3), alkenyl (prefer
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