[2S,8R,11S,15S]-8-(tert-butyldiphenylsilanyloxymethyl)-15-(4,4-dichloropentyl)-11-(1-hydroxy-1-methyl-ethyl)-2-isopropyl-14,14-dimethyl-12,16-dioxa-20-thia-3,6,9,21-tetraaza-bicyclo[16.2.1]heneicosa-1(21),18-diene-4,7,10,13,17-pentaone