urobilinogen
  尿膽素原; 半膽紅素
  uro·bi·lin·o·gen /ˌjʊrəbaɪˈlɪnəʤən, ˌʤɛn/ 名詞
  尿膽素原
  urobilinogen
       n : a chromogen formed in the intestine from the breakdown of
           bilirubin; yields urobilins on oxidation; some is
           excreted in the feces and some is resorbed and excreted
           in bile or urine [syn: stercobilinogen]