| http://www.w3.org/ns/prov#value | - oxide, benzoxazine, phthalazine, or cinnoline; X is a bond, O, S, SO, SO2, OCH2, C???C, C???C, C???S, SCH2, NR4 or NR4CH2; R is independently, located at any appropriate position of Ar, hydrogen, alkyl, alkenyl, phenyl, aralkyl, aralkenyl, hydroxy, hydroxyalkyl, alkoxy, alkoxyalkyl, aralkoxy, aryloxy, acyloxy, halo, haloalkyl, nitro, cyano, amino, mono- and di-alkylamino, acylamino, carboxy, carbo
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