C9H6BrClN2O

Exact Mass: 271.94

Mol. Wt.: 273.51 m/e: 273.93 (100.0%), 271.94 (77.4%), 275.93 (24.1%), 274.94 (10.2%), 272.94 (7.8%), 276.93 (2.6%)

C, 39.52; H, 2.21; Br, 29.21; Cl, 12.96; N, 10.24; O, 5.85