[
  {
    "gtc_id":	"G12460GN",
    "iupac_condensed":	null,
    "motif":	"[{\"label\":\"GM4\",\"id\":\"G30207PZ\"},{\"label\":\"Polysialic acid\",\"id\":\"G00065MO\"}]",
    "subsumption":	"Linkage-defined saccharide",
    "mass":	null
  }
]