[
  {
    "gtc_id":	"G52526DX",
    "iupac_condensed":	"Glc(b1-4)GlcA(b1-4)Glc",
    "motif":	null,
    "subsumption":	"Linkage-defined saccharide",
    "mass":	518.15
  },
  {
    "gtc_id":	"G18444RM",
    "iupac_condensed":	null,
    "motif":	null,
    "subsumption":	"Fully-defined saccharide",
    "mass":	null
  },
  {
    "gtc_id":	"G25342YZ",
    "iupac_condensed":	"GlcA(b1-4)Glc(?1-",
    "motif":	null,
    "subsumption":	"Linkage-defined saccharide",
    "mass":	356.1
  }
]