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(2014/01/23)5,6-dihydrofuro[2,3-d]pyridazine-4,7-dione
4-(4-methoxyphenylamino)-7-chlorofuro-[2,3-d]pyridazine
4-chloroanilino-7-chlorofuro[2,3-d]pyridazine
4-chloro-7-[N-(4-chlorophenyl)amino]-[2,3-d]furopyridazine
4-[({4-[(4-methoxyphenyl)amino]furo[2,3-d]pyridazin-7-yl}oxy)methyl]-N-methyl-2-pyridinecarboxamide