The study of the fragmentations of the protonated molecular species [M＋H]^＋ and selected fragment ions allowed proposals for the main fragmentation pathways of the title compound. In order to better understand the fragmentation pathways, the MS3 and MS4 spectra of the title compound were obtained. The main fragmentation pathways occur by the cleavage of the C-CO bonds between N-methylpyrrole and carbonyl groups, CO-NH amide bonds, NH-C bonds between the NH groups and the N-methylpyrrole rings, and N-C bonds in 1,4,7,10-tetraazacyclododecane. Electrospray ionization was proven to be a good method for the structural characterization and identification of this kind of compound.
