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Occurrence of various ring combinations in the spirocyclic natural products analyzed in this review.
| Ring combinations |
|
|
|
|
|
|
|
|
0 | 0 | 7 | 7 | 0 | 0 |
|
|
0 | 0 | 1 | 1 | 0 | 4 |
|
|
7 | 1 | 58 | 50 | 14 | 4 |
|
|
7 | 1 | 50 | 27 | 4 | 0 |
|
|
0 | 0 | 14 | 4 | 1 | 0 |
|
|
0 | 4 | 4 | 1 | 0 | 0 |
