{"id":677,"sequence":"GPPGPMGPPGLAGPPGESGR","proforma":"[Oxidation][Oxidation]^3?GPPGPMGPPGLAGPPGESGR","modifications":[{"name":"Oxidation","count":1,"n_term":false,"unimod":35,"position":null,"residues":"M"},{"name":"Oxidation","count":3,"n_term":false,"unimod":35,"position":null,"residues":"P"}],"mods_ambiguous":false,"neutral_mass":1847.8472113637,"mh":1848.85449,"url":"https://msipep.com/peptide/677/"}