-3.8201.7533.62356.411-2.71.48142 °C0λ⁴-iron(4+) ion 10-(2-carboxyethyl)-5,19-diethenyl-4,9,18-trimethyl-15-(prop-1-en-2-yl)-2λ⁴-oxa-14,20,21,22-tetraazatetracyclo[15.2.1.1³,⁶.1⁸,¹¹]docosa-1,3(22),4,6,8,10,12,14,16,18-decaen-2-ylium-20,21-diide82.78.421107.4InChI=1S/C4H6O/c1-2-3-4-5/h2-4H,1H3/b3-2+