[
  {
    "gtc_id":	"G57321FI",
    "iupac_condensed":	"GalNAc(a1-",
    "motif":	"[{\"label\":\"Tn antigen\",\"id\":\"G57321FI\"}]",
    "subsumption":	null,
    "mass":	null
  },
  {
    "gtc_id":	"G79333MY",
    "iupac_condensed":	"Gal(b1-4)GlcNAc(a1-",
    "motif":	null,
    "subsumption":	"Fully-defined saccharide",
    "mass":	383.14
  }
]