{"id":675,"sequence":"GPPGPMGPPGLAGPPGESGR","proforma":"[Oxidation]^2?GPPGPMGPPGLAGPPGESGR","modifications":[{"name":"Oxidation","count":2,"n_term":false,"unimod":35,"position":null,"residues":"P"}],"mods_ambiguous":false,"neutral_mass":1815.8573821237,"mh":1816.86466,"url":"https://www.msipep.com/peptide/675/"}