Table 1. Summary of bond-valence-sum (BVS) calculations on the uranium atoms U1–U7 in (I).

Atom	Atomic charge calculated by BVS (v.u.)
U1	3.73
U2	3.99
U3	4.34
U4	3.86
U5	3.77
U6	5.16
U7	3.93
Average	4.11