(3R,4R,5R,13aR,13bR)-4,5-dihydroxy-5-[(1R)-1-hydroxyethyl]-3-(propan-2-yl)-4,5,8,10,12,13,13a,13b-octahydro-2H-[1,6]dioxacycloundecino[2,3,4-gh]pyrrolizine-2,6(3H)-dione