[
  {
    "gtc_id":	"G44941AO",
    "iupac_condensed":	null,
    "motif":	"[{\"label\":\"Tn antigen\",\"id\":\"G57321FI\"}]",
    "subsumption":	"Fully-defined saccharide",
    "mass":	null
  },
  {
    "gtc_id":	"G18792XF",
    "iupac_condensed":	"Glc(b1-2)[GalA(a1-4)GalNAc(b1-4)]GlcA(b1-3)GalNAc(b1-",
    "motif":	null,
    "subsumption":	"Fully-defined saccharide",
    "mass":	938.29
  }
]