The 1-(2-methoxyethyl)-2-methyl-4,9-dioxo-3-(pyrazin-2-ylmethyl)-4,9-dihydro-1H-naphtho[2,3-d]imidazol-3-ium bromide of the invention and its crystals, particularly α- and β-form Crystals, have no hygroscopic property, have excellent stability and therefore are useful as production materials of medicines. Particularly, the β-form Crystal is most stable and markedly useful as a bulk for medicines.
本发明的 1-(2-甲氧基乙基)-2-甲基-4,9-二氧代-3-(
吡嗪-2-基甲基)-4,9-二氢-1H-
萘并[2,3-d]
咪唑-3-鎓
溴化物及其晶体,特别是 α 型和β型晶体,没有吸湿性,具有极好的稳定性,因此可用作药物的生产原料。尤其是 β-形式晶体最为稳定,可作为药物的散装材料。