[
  {
    "gtc_id":	"G22754DG",
    "iupac_condensed":	"GlcA(b1-3)L-GalNAc(?1-3/4)GalNAc(?1-",
    "motif":	null,
    "subsumption":	"Linkage-defined saccharide",
    "mass":	600.2
  }
]