ALLOXAN, or Mesoxalyl Urea, C 4 H 2 N 2 0 4 or CO NCO an oxidation product of uric acid, being NNH - CO/ obtained from it by the action of cold nitric acid, C 5 H 4 N 4 03 -}- H 2 O + 0= C4H2N204 -FCO(NH 2) 2.
Nencki has shown that alloxan combines with thiourea in alcoholic solution, in the presence of sulphur dioxide to form pseudothiouric acid, C 5 H 6 N 4 S0 3.
MESOXALIC ACID (dioxymalonic acid), (HO 2 C) 2 C(OH) 2 or C3H406, is obtained by hydrolysis of alloxan with baryta water (J.
The ureides of oxy-acids and dibasic acids form closed chain compounds (see Allantoin; Alloxan; Hydantoin; Purin).
Tartronyl urea (dialuric acid), C0[NH CO]CH OH, formed by the reduction of alloxan (J.
C ALLOXANTIN $ H 4 N 4 0 7.3H 2 0, a product obtained by the combination of alloxan and dialuric acid, probably possessing the constitution NH - CO CO - NH O - O - H NH - C CO - NH one of the three molecules of water being possibly constitutional.