A1ISC a1isc (1S,2R,3S,5S,6S,16E,18E,20R,21S)-11-chloro-21-hydroxy-12,20-dimethoxy-2,5,9,16-tetramethyl-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 5-{1-[6-({(4R)-2-[(3R)-2,6-dioxopiperidin-3-yl]-1-oxo-2,4-dihydro-1H-isoindol-4-yl}amino)-6-oxohexyl]-1H-1,2,3-triazol-4-yl}pentanoate A1ISC