{
"<cmm>": {"deltaChem":[3,2,1,1],"desc":"Carboxyamidomethylation C  unimod:4"},
"<ox>": {"deltaChem":[0,0,0,1],"desc":"oxidation oxidation unimod:35" } ,
"ace-":  {"deltaChem":[2,2,0,1],"desc":"Acetylation N-term unimod:1" },
"pyro-": {"deltaChem":[-3,0,-1,0],"desc":"Pyro-glu from Q unimod:28" }}
