647015-41-6

Oxacycloeicosa-3,5,7,11,13-pentaen-2-one,10,17-bis[[(1,1-dimethylethyl)dimethylsilyl]oxy]-18-methoxy-20-(methoxymethyl)-3,5,7,9,13-pentamethyl-,(3E,5E,7E,9R,10R,11E,13E,17S,18S,20S)-