| http://www.w3.org/ns/prov#value | - Useful soluble iron compounds include the metal or metalloxy beta-ketoenolates of the formula: ##EQU1## in which M is an iron ion, an ironoxy ion, or an iron hydroxy ion, in which n is an integer equal to the valence of the iron, ironoxy ion or iron hydroxy ion, in which each of R1 and R3 is a substituent selected from the group consisting of hydrogen and an organic substituent selected from alkyl
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