1D4R|1|C|MG|301 MG ion 1D4R|1|C|MG|301||||6_555 MG ion 1D4R|1|B|MG|302 MG ion 1D4R|1|B|MG|303 MG ion 1D4R|1|A|MG|304 MG ion 1D4R|1|A|MG|305 MG ion