echinenone

{{chembox

| Verifiedfields = changed

| Watchedfields = changed

| verifiedrevid =

| ImageFile=Echinenone.svg

| ImageSize=200px

| IUPACName=β,β-Caroten-4-one

| SystematicName=2,4,4-Trimethyl-3-[(1E,3E,5E,7E,9E,11E,13E,15E,17E)-3,7,12,16-tetramethyl-18-(2,6,6-trimethylcyclohex-1-en-1-yl)octadeca-1,3,5,7,9,11,13,15,17-nonaen-1-yl]cyclohex-2-en-1-one

| OtherNames=Myxoxanthine

|Section1= {{Chembox Identifiers

| CASNo_Ref = {{cascite|correct|??}}

| CASNo=432-68-8

| UNII_Ref = {{fdacite|correct|FDA}}

| UNII = LJ5IO02MNQ

| PubChem=5281236

| ChemSpiderID_Ref = {{chemspidercite|changed|chemspider}}

| ChemSpiderID = 4444648

| SMILES = CC1=C(C(CCC1)(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(=O)CCC2(C)C)C)/C)/C

| InChI =

| InChIKey = QXNWZXMBUKUYMD-QQGJMDNJSA-N

| StdInChI_Ref = {{stdinchicite|changed|chemspider}}

| StdInChI =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+

| StdInChIKey_Ref = {{stdinchicite|changed|chemspider}}

| StdInChIKey = SJWWTRQNNRNTPU-XJUZQKKNSA-N

}}

| Section2 = {{Chembox Properties

| C=40|H=54|O=1

| Appearance =

| Density =

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| Solubility =

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Echinenone is a xanthophyll, with formula C₄₀H₅₄O. It is found in some cyanobacteria.{{Cite journal|author = E. H. Schwartzel and J. J. Cooney |title= Isolation and identification of echinenone from Micrococcus roseus|journal= Journal of Bacteriology|volume= 104|issue = 1|pages = 272–274|date= October 1970|doi= 10.1128/jb.104.1.272-274.1970|pmid = 5473895|pmc=248210}} It is synthesized from β-carotene by the enzyme beta-carotene ketolase (or CrtW). It has also been isolated from sea urchins.{{cite journal|last1=Lederer|first1=E.|last2=Moore|first2=T.|title= Echinenone as a Provitamin A|journal= Nature|volume= 137|issue= 3476|year= 1936|pages= 996|issn= 0028-0836|doi= 10.1038/137996b0|doi-access= free|bibcode=1936Natur.137..996L }}