2-Pentenoic acid,5-[2-[(1Z)-3-[(methoxycarbonyl) amino]-1-propenyl]-4-oxazolyl]-,(1R,3S,5R,7R,9R,13R,15S,18S)-3-methoxy-18- methyl-13-[(1E)-4-methyl-1-pentenyl]-11- oxo-12,19,20-trioxatricyclo[13.3.1.15,9]eicos-7- yl ester,(2Z)-