(E)-3-[(13E,15E)-(3S,6S,9R,10R,11S,12S,18S,21S)-10,12-Dihydroxy-3-(3-hydroxy-benzyl)-6-isopropyl-11-methyl-2,5,8,20-tetraoxo-9-(3-oxo-butyl)-19-oxa-1,4,7,25-tetraaza-bicyclo[19.3.1]pentacosa-13,15-dien-18-yl]-but-2-enal