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| Na1—OW5 | 2.3776 (6) | Na2—OW7 | 2.3935 (6) |
| Na1—OW6i | 2.4181 (6) | Na2—OW9 | 2.4325 (6) |
| Na1—OW11 | 2.4184 (6) | Na2—OW6 | 2.4415 (6) |
| Na1—OW10 | 2.4194 (6) | Na2—OW10ii | 2.4667 (6) |
| Na1—OW8i | 2.4473 (6) | Se1—O41 | 1.6335 (5) |
| Na1—OW9i | 2.4507 (6) | Se1—O31 | 1.6394 (5) |
| Na2—OW12 | 2.3814 (6) | Se1—O1 | 1.6398 (5) |
| Na2—OW5ii | 2.3891 (6) | Se1—O21 | 1.6421 (5) |
Symmetry codes: (i) 
; (ii) 
.
