C27H26BrF2N3O2

Exact Mass: 541.12

Mol. Wt.: 542.42

m/e: 543.12 (100.0%), 541.12 (97.9%), 542.12 (29.0%), 544.12 (28.2%), 545.12 (4.6%), 542.11 (1.1%), 544.11 (1.1%)

C, 59.79; H, 4.83; Br, 14.73; F, 7.01; N, 7.75; O, 5.90