Title: Leucopterin

CAS Registry Number: 492-11-5

CAS Name: 2-Amino-5,8-dihydro-4,6,7(1H)-pteridinetrione

Additional Names: 2-amino-4,6,7-pteridinetriol; 2-amino-4,6,7-trihydroxypteridine; 2-amino-4,6,7-trihydroxypyrimido[4,5-b]pyrazine

Molecular Formula: C6H5N5O3

Molecular Weight: 195.14

Percent Composition: C 36.93%, H 2.58%, N 35.89%, O 24.60%

Literature References: A colorless substance found in the wings of butterflies (especially of white-winged butterflies). May be obtained from xanthopterin by dehydrogenation: Wieland, Purrmann, Ann. 544, 172 (1940). Synthesis by fusing 2,4,5-triamino-6-hydroxypyrimidine with an excess of oxalic acid: Purrmann, ibid. 188. See also ref under Xanthopterin and review on pterins by Purrmann, Fortschr. Chem. Org. Naturst. 4, 64 (1945).

Properties: Fine colorless crystals forming yellow Na and Ag salts, and a sparingly sol NH4 salt. Soluble in alkaline solns with blue fluorescence.