xanthophyll echinenone 0 550.41747 550.871 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+ pdb-ccd:ECH QXNWZXMBUKUYMD-QQGJMDNJSA-N Echinenone myoxanthin beta,beta-caroten-4-one patent:GB1549643 pubmed:5473895 pubmed:17765578 kegg.compound:C08592 C40H54O patent:US4100197 4-keto-beta-carotene pubmed:11697247 reaxys:2030114 chebi_ontology cas:432-68-8 CHEBI:4746 aphanin CC1=C(/C=C/C(C)=C/C=C/C(C)=C/C=C/C=C(C)/C=C/C=C(C)/C=C/C2=C(C)C(=O)CCC2(C)C)C(C)(C)CCC1 echinenone knapsack:C00000925 pubmed:23160982 4-oxo-beta-carotene A carotenone that is β-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. beta,beta-caroten-4-one