11,15-Dioxa-2,9-diazaoctadec-17-enoic acid,4,4,6-trimethyl-10,16-dioxo-13,13-bis[[(1-oxo-2-propenyl)oxy]methyl]-,3-[(1-oxo-2-propenyl)oxy]-2,2-bis[[(1-oxo-2-propenyl)oxy]methyl]propylester