[
  {
    "gtc_id":	"G56154DE",
    "iupac_condensed":	"Gal(a1-3)Gal(b1-4)GlcNAc",
    "motif":	"[{\"label\":\"a-Gal antigen\",\"id\":\"G24432YB\"}]",
    "subsumption":	"Linkage-defined saccharide",
    "mass":	545.2
  },
  {
    "gtc_id":	"G48239WN",
    "iupac_condensed":	null,
    "motif":	"[{\"label\":\"Mannose\",\"id\":\"G70323CJ\"},{\"label\":\"O-Mannose\",\"id\":\"G70323CJ\"}]",
    "subsumption":	"Fully-defined saccharide",
    "mass":	null
  }
]