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Characteristic fragment ions
| Head | a’ | a0 | a1(3) | a1(4) | a1(5) | a1(Asn) |
|---|
| Ac | | | 100.07624 | 114.09189 | 128.10754 | 157.06132 |
| Bz | | 105.03404 | 162.09189 | 176.10156 | 190.12319 | 219.07697 |
| PhAc | 91.05478 | 119.04969 | 176.10754 | 190.12319 | 204.13884 | 233.09262 |
| 4-OH-Bz | | 121.02895 | 178.08680 | 192.10245 | 206.11810 | 235.07188 |
| 4-OH-PhAc | 107.04969 | 135.04460 | 192.10245 | 206.11810 | 220.13375 | 249.08753 |
| 2,5-(OH)₂-Bz | | 137.02387 | 194.08172 | 208.09737 | 222.11302 | 251.06680 |
| Phe | 120.08133 | 148.07624 | 205.13409 | 219.14974 | 233.16539 | 262.11917 |
| PhLac | 121.06534 | 149.06025 | 206.11810 | 220.13375 | 234.14940 | 263.10318 |
| 2,4-(OH)₂-PhAc | 123.04461 | 151.03952 | 208.09737 | 222.11302 | 236.12867 | 265.08245 |
| IndAc | 130.06568 | 158.06059 | 215.11844 | 229.13409 | 243.14974 | 272.10352 |
| Tyr | 136.07624 | 164.07115 | 221.12900 | 235.14465 | 249.16030 | 278.11408 |
| 4-OH-PhLac | 137.06026 | 165.05517 | 222.11302 | 236.12867 | 250.14432 | 279.09810 |
| 4-OH-IndAc | 146.06059 | 174.05550 | 231.11335 | 245.12900 | 259.14465 | 288.09843 |
| Trp | 159.09223 | 187.08714 | 244.14499 | 258.16064 | 272.17629 | 301.13007 |
| IndLac | 160.07624 | 188.07115 | 245.12900 | 259.14465 | 273.16030 | 302.11408 |
| Tail | z1(3) | z1(4) | z1(5) | z2(33) | z2(34 / 43) |
|---|
| NH2 | 58.06567 | 72.08132 | 86.09697 | 115.12352 | 129.12917 |
| Ac | 100.07624 | - | - | 157.13409 | 171.14974 |
| Gu | - | 114.10312 | - | - | 171.16097 |
| Arg | 214.16679 | - | - | 271.22463 | 285.24028 |