{"id":1243,"sequence":"VNPTVFFDIAVDGEPLGR","proforma":"[Acetyl]-VNPTVFFDIAVDGEPLGR","modifications":[{"name":"Acetyl","count":1,"n_term":true,"unimod":1,"position":null,"residues":""}],"mods_ambiguous":false,"neutral_mass":1987.0050918937002,"mh":1988.01237,"url":"https://www.msipep.com/peptide/1243/"}