dehydroretinal dehydroretinal dehydroretinal (3,4-dehydroretinal) is a derivative metabolite of retinal belonging to the group of vitamin a2 as a retinaldehyde form, besides the endogenously present 3,4-dehydroretinol and 3,4-dehydroretinoic acid. dehydroretinal names iupac name 3,4-didehydroretinal systematic iupac name (2e,4e,6e,8e)-3,7-dimethyl-9-(2,6,6-trimethylcyclohexa-1,3-dien-1-yl)nona-2,4,6,8-tetraenal other names 3,4-dehydroretinal; 3,4-didehydroretinaldehyde identifiers cas number 472-87-7 3d model (jsmol) interactive image 3dmet b00875 chebi chebi:28537 chemspider 4444397 echa infocard 100.006.781 ec number 207-457-7 kegg c05918 mesh dehydroretinal pubchem cid 5280866 unii hv8t003xo1 comptox dashboard (epa) dtxsid30878517 inchi inchi=1s/c20h26o/c1-16(8-6-9-17(2)13-15-21)11-12-19-18(3)10-7-14-20(19,4)5/h6-13,15h,14h2,1-5h3/b9-6+,12-11+,16-8+,17-13+key: qhnvwxuulmzjkd-ovsjkpmpsa-ninchi=1/c20h26o/c1-16(8-6-9-17(2)13-15-21)11-12-19-18(3)10-7-14-20(19,4)5/h6-13,15h,14h2,1-5h3/b9-6+,12-11+,16-8+,17-13+key: qhnvwxuulmzjkd-ovsjkpmpba smiles o=c\c=c(\c=c\c=c(\c=c\c1=c(\c=c/cc1(c)c)c)c)c properties chemical formula c20h26o molar mass 282.427 g·mol−1 except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). infobox references the livers of some freshwater fishes and some fish found in india contain a higher ratio of dehydroretinal to retinal than do other species.