Rapamycin Impurity 2

Chemical Name: (1R,9S,12S,15R,16E,18R,19R,21R,23S,24E,26E,28E,30S,32S,35R)-30-Ethoxy-1,18-Dihydroxy-12-((1R)-2-[(1S,3R,4R)-4-(2-Hydroxyethoxy)-3-Methoxycyclohexy]-1-methylethyl)-19-methoxy-15,17,21,23,29,35-hexamethyl-11,36-dioxa-4-aza-tricyclo[30.3.1.04.2]-hexatriaconta-16,24,26,28-tetraene-2,3,10,14,20-pentaone-16-o-ethyl-40-o-(2-hydroxyethyl)-rapamycin