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Only low R-factor structures (R 0.05) are taken into account (see complete list in Table S1). Disordered, error-containing, polymeric and powder structures were excluded from the search.
| No. of structures | |
|---|---|
| Homo-catemer | |
| SS-S | 23 |
| SA-S | 67 |
| AS-A | 3 |
| AA-A | 3 |
| Hetero-catemer | |
| SS-AAS-S | 1 |
| SS-AAA-S | 17 |
| SA-AAS-S | 1 |
| SA-AAA-S | 7 |
