(R)-6-((1E,3Z,5R,7E,9E,11R,12R,13S,14R,15S)-14-(tert-butyl(dimethyl)silyloxy)-3-ethyl-5,9,11,13,15-pentamethyl-12-oxo-heptadeca-1,3,7,9-tetraenyl)-5,6-dihydro-2H-pyran-2-one

(R)-6-((1E,3Z,5R,7E,9E,11R,12R,13R,14R,15S)-14-(tert-butyl(dimethyl)silyloxy)-3-ethyl-12-hydroxy-5,9,11,13,15-pentamethylheptadeca-1,3,7,9-tetraenyl)-5,6-dihydro-2H-pyran-2-one

(8E,10E,14Z,16E)-[3S,4R,5R,7R,13R,17(2R)]-4-(tert-butyldimethylsilanyloxy)-15-ethyl-17-(6-hydroxy-3,6-dihydro-2H-pyran-2-yl)-3,5,7,9,13-pentamethylheptadeca-8,10,14,16-tetraen-6-ol

C19-epi-C19-triisopropylsilyl callystatin A

(R)-6-((1E,3Z,7E,9E)-(5R,11R,12R,13R,14S,15S)-3-Ethyl-12-hydroxy-5,9,11,13,15-pentamethyl-14-triisopropylsilanyloxy-heptadeca-1,3,7,9-tetraenyl)-5,6-dihydro-pyran-2-one