2,10,12,16,18-Nonadecapentaenoic acid, 19-(3,6-dihydro- 3-methyl-6-oxo-2H-pyran-2-yl)-6-hydroxy-9-(hydroxymethyl)- 3,5,7,11,15,17-hexamethyl-8-oxo- Elatocerin analog NSC606865