2H-Pyrrol-2-one, 3-[11-(hexahydro-3-hydroxy-5-methylfuro[3,2-b]furan-2-yl)- 1-oxo-2,4,6,8,10-undecapentaenyl]-1,5-dyhydro-4-hydroxy- 1-methyl-5-(1-methylethyl)- Erythroskyrin NSC373408