(1s,2r,3s,5s,6s,16e,18e,20r,21s)-11-chloro-21-hydroxy-12,20-dimethoxy-2,5,16-trimethyl-8,23-dioxo-4,24-dioxa-9,22-diazatetracyclo[19.3.1.1~10,14~.0~3,5~]hexacosa-10(26),11,13,16,18-pentaen-6-yl n-acetyl-n-methyl-l-alaninate