N- {5-[(6,7-dimethoxy-4-quinolinyl) oxy] -2-pyridinyl having an Axl inhibitory activity and useful as a prophylactic and / or therapeutic agent for diseases of the immune system, cancer, etc. } Ethane sulfonate of -2,5-dioxo-1-phenyl-1,2,5,6,7,8-hexahydro-3-quinolinecarboxamide, its crystal crystallization, and its pharmaceutical composition.본 발명은 Axl 저해 활성을 갖고, 면역계 질환, 암 등의 예방 및/또는 치료약으로서 유용한, N-{5-[(6,7-디메톡시-4-퀴놀리닐)옥시]-2-피리디닐}-2,5-디옥소-1-페닐-1,2,5,6,7,8-헥사히드로-3-퀴놀린카르복사미드의 에탄술폰산염, 그 결정, 및 그 의약 조성물에 관한 것이다.