11,14-Dioxa-2,9-diazaheptadec-16-enoicacid, 4,4,6,16(or 4,6,6,16)-tetramethyl-10,15-dioxo-,2-[(2-methyl-1-oxo-2-propen-1-yl)oxy]ethyl ester [ 72869-86-4 ]