Cladribine EP Impurity A

9-(2-Deoxy-β-D-erythro-pentofuranosyl)-9H-purin-2,6-diamine; (2R,3S,5R)-5-(2,6-Diamino-9H-purin-9-yl)-2-(hydroxymethyl)tetrahydrofuran-3-ol; 2-Amino-2'-desoxyadenosine; 2,6-Diamino-9-(2-deoxy-β-D-erythro-pentofuranosyl)-9H-purine;  2,6-Diaminopurine-2'-deoxyriboside; 2-Amino-2'-deoxy-adenosine