| http://www.w3.org/ns/prov#value | - The method of claim 1 where the texaphyrin has the structure: ##STR4## where: M is H or a diamagnetic metal cation;R1, R2, R3, R4, R5 and R6 are independently hydrogen, hydroxyl, alkyl, hydroxyalkyl, alkoxy, hydroxyalkoxy, saccharide, carboxyalkyl, carboxyamidealkyl, a site-directing molecule or a couple to a site-directing molecule; and N is an integer less than or equal to 2. 4.
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