A CRYSTAL OF 1-(2-METHOXYETHYL)-2-METHYL-4, 9-DIOXO-3-(PYRAZIN-2-YLMETHYL)-4, 9-DIHYDRO-1 H-NAPHTHO 2,3,-D IMIDAZOL-3-IUM BROMIDE

摘要

The l-(2-methoxyethyl)-2-melthyl-4, 9-dioxo-3-(pyrazin-2-ylmethyl)-4, 9-dihydro-lH-naphtho [2 , 3-d] imidazol-3-ium bromide of the invention and its crystals, particularly α-and ß-form Crystals, have no hygroscopic property, have excellent stability and therefore are useful as production materials of medicines. Particularly, the ß-form Crystal is most stable and markedly useful as a bulk for medicines.