3,4-diphenylcyclobut-3-ene-1,2-dione

11-[5-[[2-(azepan-1-yl)-1-butyl-5-cyano-4-methyl-6-oxopyridin-3-yl]methylidene]-4-oxo-2-sulfanylidene-1,3-thiazolidin-3-yl]undecanoic acid

cis-(Ph2Bi)2Fe(CO)4

cis-[(CO)4Fe(SnMe3)2]