Abstract: The present invention relates to a sulfate of a compound of chemical formula 1, and a crystalline form thereof. The sulfate of the compound of chemical formula 1, according to the present invention, has much higher solubility than other salts thereof, and exhibits excellent stability and absorption into the body. In addition, such a sulfate can form various crystalline forms, and these crystalline forms are also stable and undergo almost no reduction in purity, even after long-term storage under various conditions, and thus are useful for storage.

Abstract: The present invention relates to a Crystalline Form 1 of a compound of Chemical formula 1 having physically and chemically outstanding characteristics compared to amorphous forms and other crystalline forms of the compound of Chemical Formula 1. Crystalline form A of the compound of Chemical Formula 1 according to the present invention, compared to amorphous forms or other crystalline forms, does not denature even at prolonged exposure to harsh conditions, has low water sorption, is advantageous for formulation as the crystalline form does not change even under pressure or when pulverized, and the crystalline form itself has excellent stability, being useful for storage for extended periods.