Costunolide; (3aS,6E,10E,11aR)-6,10-dimethyl-3-methylene-3a,4,5,8,9,11a-hexahydrocyclodeca[b]furan-2(3H)-one; CAS No.: 553-21-9; (3aS,6E,10E,11aR)-6,10-dimethyl-3-methylene-3a,4,5,8,9,11a-hexahydrocyclodeca[b]furan-2(3H)-one (CAS 553-21-9) underscores ChemShuttle s expertise in cycle compounds for sesquiterpene lactones. This furanone derivative (CAS 553-21-9) serves as a cycle compound in anti-inflammatory and anticancer natural product research. As a Leading Chemicals Distributor, ChemShuttle provides CAS 553-21-9 with botanical sourcing documentation.