| 中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
|---|---|---|---|---|
| —— | 13-nor-elemasteiractinolide | 121401-11-4 | C14H20O2 | 220.312 |
Five new sesquiterpene lactones, callitrin (1) (an elemanolide), callitrisin (2) and dihydrocallitrisin (6) (eudesmanolides), and columellarin (4) and dihydrocolumellarin (5) (guaianolides) have been isolated from Callitris columellaris heartwood along with the germacranolide (3) which is a new natural product previously only known synthetically. These compounds are the first sesquiterpene lactones isolated from the Cupressaceae. Lactones (1), (2) and (6) all share a novel cis-fused lactone ring in which the C7-C11 bond is axial to a cyclohexane ring.