17500-72-0 Aqua-tetrakis(trifluoroacetylacetonato)thorium(IV) NSC177708 Thorium(IV) tetrakis(trifluoroacetylacetonate) Thorium, tetrakis(1,1,1-trifluoro-2,4-pentanedionato)- Thorium, tetrakis(1,1,1-trifluoro-2,4-pentanedionato-O,O')-