has role has parent hydride beta-carotene carotenone echinenone 4-keto-beta-carotene 4-oxo-beta-carotene 550.417 550.85620 A carotenone that is beta-carotene in which the 4 position has undergone formal oxidation to afford the corresponding ketone. Isolated as orange-red crystals, it is widely distributed in marine invertebrates. Beilstein:2030114 C40H54O CAS:432-68-8 CC(\C=C\C=C(C)\C=C\C1=C(C)CCCC1(C)C)=C/C=C/C=C(C)/C=C/C=C(C)/C=C/C1=C(C)C(=O)CCC1(C)C CHEBI:4746 COMe:MOL000094 Echinenone InChI=1S/C40H54O/c1-30(18-13-20-32(3)23-25-36-34(5)22-15-28-39(36,7)8)16-11-12-17-31(2)19-14-21-33(4)24-26-37-35(6)38(41)27-29-40(37,9)10/h11-14,16-21,23-26H,15,22,27-29H2,1-10H3/b12-11+,18-13+,19-14+,25-23+,26-24+,30-16+,31-17+,32-20+,33-21+ KEGG:C08592 KNApSAcK:C00000925 PDBeChem:ECH PMID:11697247 PMID:17765578 PMID:23160982 PMID:5473895 Patent:GB1549643 Patent:US4100197 QXNWZXMBUKUYMD-QQGJMDNJSA-N Reaxys:2030114 aphanin beta,beta-caroten-4-one chebi_ontology echinenone myoxanthin bacterial metabolite