4,17-Dioxabicyclo[14.1.0]heptadecane-5,9-dione,3-[(1Z)-1-chloro-2-[2-(hydroxymethyl)-4-oxazolyl]ethenyl]-7,11-dihydroxy-8,8,10,12,16-pentamethyl-, (1S,3S,7S,10R,11S,12S,16R)-