{"id":1240,"sequence":"SIHFSSPVFTSR","proforma":"[Acetyl]-SIHFSSPVFTSR","modifications":[{"name":"Acetyl","count":1,"n_term":true,"unimod":1,"position":null,"residues":""}],"mods_ambiguous":false,"neutral_mass":1405.6990139237,"mh":1406.70629,"url":"https://www.msipep.com/peptide/1240/"}