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[Oxidation][Oxidation]^2?GPPGPMGPPGLAGPPGESGR

Sequence: GPPGPMGPPGLAGPPGESGR (20 residues)
Modifications: 1× Oxidation (M) Unimod:35; 2× Oxidation (P) Unimod:35
Monoisotopic mass: 1831.85230 Da
Calculated ions: [M+H]+ 1832.8596 · [M+Na]+ 1854.8415 · [M+K]+ 1870.8155 · [M+2H]2+ 916.9334

Position in protein

Collagen alpha-1(I) chain residues 995–1014 of 1464

Protein	Measured m/z	Calc. m/z	ppm	Species · tissue	Source	Status
Collagen alpha-1(I) chain UniProt P02452	1832.8500	1832.8596	-5.2	Homo sapiens (human) · Pancreas · Pancreatic tumour	10.1007/s00216-010-3554-6	Approved Reported theoretical m/z differs from the calculated value