Molecular structure of 3 with displacement ellipsoids at 50% and hydrogen atoms omitted for clarity. Selected bond lengths (Å) and angles (°) for 3:U1-N1, 2.300(4); U1-N2, 2.316(4); U1-N3, 2.284(4); U1-N4, 2.580(4); U1-O1, 2.116(3); U2-O1, 2.138(3); U2-O2, 2.186(4); U2-N5, 2.322(4); U2-N6, 2.289(4); U2-N7, 2.541(4); U2-N8, 2.691(4); N7-C44, 1.254(6); C44-O3, 1.372(6); C43-C44, 1.478(7); C43-O2, 1.343(7); U1-O1-U2, 160.87(16); O2-U2-N7, 65.06(14); O2-C43-C44, 109.8(5); C43-C44-N7, 119.6(5).