ABSTRACT
From mass spectrum, the m/z of the molecular ion (158) is deduced, and therefore there is no nitrogen or an even number of nitrogen atoms. There is likely a methoxy group (OMe) in the molecule since the loss of 31 mass units (M-31) is the base peak of the spectrum. The loss of methyl (M-15) appears too, with a relative abundance of 12%. Moreover, an abundant peak at m/z 99 (M-59) is indicative of the consecutive loss of .OMe and CO (M-31–28). The suspicion of the presence of a methoxycarbonyl unit (–COOMe) is reinforced by observing the peak at m/z 59 (MeOOC+).
