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[Oxidation]^3?VGPPGPSGNAGPPGPPGPAGK

Sequence: VGPPGPSGNAGPPGPPGPAGK (21 residues)
Modifications: 3× Oxidation (P) Unimod:35
Monoisotopic mass: 1811.88023 Da
Calculated ions: [M+H]+ 1812.8875 · [M+Na]+ 1834.8694 · [M+K]+ 1850.8434 · [M+2H]2+ 906.9474

Position in protein

Collagen alpha-1(I) chain residues 883–903 of 1464

Protein	Measured m/z	Calc. m/z	ppm	Species · tissue	Source	Status
Collagen alpha-1(I) chain UniProt P02452	1812.8800	1812.8875	-4.1	Homo sapiens (human) · Pancreas · Pancreatic tumour	10.1007/s00216-010-3554-6	Approved Reported theoretical m/z differs from the calculated value