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Coupling constant values for key protons on the bis-lactone ring.
| 3JH3-H4 | 3JH7-H8 | 3JH8-H9 | |
|---|---|---|---|
| compounds 1–3 | 7.5 Hz | 10.5 Hz | 10.5 Hz |
| compounds 4–8 | 7.5 Hz | 10.0 Hz | 10.0 Hz |
| compound 9 | 7.5 Hz | 10.0 Hz | 10.0 Hz |
| compound 10 | 7.5 Hz | 9.0 Hz | 9.0 Hz |
| compound 17 | 7.5 Hz | 10.0 Hz | 10.0 Hz |
