ABSTRACT
Two peaks separated by 2 mass units with a peak height ratio of 1 : 1 (m/z 194 and m/z 196) indicate that the molecule contains a bromine atom. Monoisotopic mass is even, so there is no nitrogen in the molecule, or at least not an odd number of nitrogen atoms. The loss of 45 and 73 mass units suggests the presence of an ethoxycarbonyl group (M-OEt and M-COOEt). This idea is supported by the infrared spectrum, which shows an intense absorption at 1731 cm–1.
