| 摘要 |
Crystal forms of (3R, 4S)-7-hydroxymethyl-2,2,9-trimethyl-4-(phenethylamino)-3,4-dihydro-2H-pyrano[2,3-g]quinolin-3-ol, which is an excellent medicine, and processes for producing the crystal forms. The processes comprise crystallizing (3R, 4S)-7-hydroxymethyl-2,2,9-trimethyl-4-(phenethylamino)-3,4-dihydro-2H-pyrano[2,3-g]quinolin-3-ol from an acetic acid ester solvent, an aliphatic hydrocarbon solvent, a nitrile solvent, an aromatic hydrocarbon solvent, a ketone solvent, or an ether solvent. The crystal forms are obtained by the processes. |
