[
  {
    "gtc_id":	"G51817XM",
    "iupac_condensed":	"Xyl(b1-4)GlcA(b1-",
    "motif":	null,
    "subsumption":	"Fully-defined saccharide",
    "mass":	326.08
  },
  {
    "gtc_id":	"G19361XC",
    "iupac_condensed":	"Gal(b1-2)[Xyl(b1-4)]GlcA(b1-",
    "motif":	null,
    "subsumption":	"Fully-defined saccharide",
    "mass":	488.14
  }
]