Rapamycin Impurity 4

Chemical Name: (2R,3S,6S,E)-1-((1S,3R,4R)-4-(2-hydroxyethoxy)-3-methoxycyclohexyl)-2,6,8-trimethyl-5,9-dioxonon-7-en-3-yl (S)-1-(2-((2R,3R,6S)-6-((2S,3E,5E,7E,9S,11R)-2,13-dimethoxy-3,9,11-trimethyl-12-oxotrideca-3,5,7-trien-1-yl)-2-hydroxy-3-methyltetrahydro-2H-pyran-2-yl)-2-oxoacetyl)piperidine-2-carboxylate