Synonyms: 5,6-DIAMINO-4-PYRIMIDINOL HEMISULFATE;4,5-DIAMINO-6-HYDROXYPYRIMIDINE HEMISULFATE;4,5-DIAMINO-6-HYDROXYPYRIMIDINE HEMISULFATE HYDRATE;4,5-DIAMINO-6-HYDROXYPYRIMIDINE HEMISULPHATE HEMIHYDRATE;4,5-Diamino-6-hydroxypyrimidinehemisulfatehemihydrate;4,5-diamino-6-hydroxypyrimidine hemisulfate salt;5,6-diamino-4-pyrimidinol hemisulfate salt;4,5-DIAMINO-6-HYDROXYPYRIMIDINE (HEMISULPHATE CRYSTALLINE) 99%