(3S,6R,7S,8S)-11-((2R,3S)-3-((S,E)-2-(2-acetylhydrazinyl)-3-methyl-4-(2-methylthiazol-4-yl)but-3-en-1-yl)-2-methyloxiran-2-yl)-3,7-dihydroxy-4,4,6,8-tetramethyl-5-oxoundecanoic acid