benzyl 1-(9H-fluoren-9-yl)-3,6-dioxo-10-(trifluoromethyl)-2,9-dioxa-4,7-diazaundecan-11-oate

benzyl 1-(9H-fluoren-9-yl)-3,6-dioxo-10-(trifluoromethyl)-2,9-dioxa-4,7-diazaundecan-11-oate ·