| abstract |
Novel compounds of the formula ##STR1## where G 1 and G 2 are each independently --OH or --N(R 2 ) 2 , provided that at least one of G 1 and G 2 is --N(R 2 ) 2 , where each R 2 is independently hydrogen, alkyl, aryl, acyl or --(A) p --R a and the other variables are as defined in the specification and claims, and novel complexes of these compounds with metals are useful in diagnostic and therapeutic methods. |