(2R,3S,6R,9R,10R,12R,14S,E)-9-((tert-butyldimethylsilyl)oxy)-3-hydroxy-10-methoxy-1-((1S,3R,4R)-3-methoxy-4-((triisopropylsilyl)oxy)cyclohexyl)-2,6,8,12,14-pentamethylhexadec-7-en-15-yne-5,11-dione

rapamycin 42-hemisuccinate methyl ester

rapamycin 42-hemisuccinate benzyl ester

31,42-bis(trimethylsilylether)rapamycin