The present application relates to ultra-pure compositions containing N4-(cyclopropylmethyl)-6-[(3R)-3-(methylamino)pyrrolidin-1-yl]pyrimidine-2,4-diamine tartrate dihydrate, methods of making the same, formulations containing the same, methods of using the same to treat H4-mediated diseases and conditions, and alternative salt forms thereof.本申請案係關於包含N4-(環丙基甲基)-6-[(3R)-3-(甲基胺基)吡咯啶-1-基]嘧啶-2,4-二胺酒石酸鹽二水合物之超純組成物、製造彼之方法、包含彼之調配物、使用彼治療H4-仲介之疾病及病情之方法、與其替代鹽形式。