2-(3-cyclopropoxy-4-difluoromethoxyphenyl)-1,5-dihydropyrrolo[2,3-d]pyridazin-4-one

ethyl 2-methoxymethyl-1H-pyrrol-3-carboxylate

ethyl 5-bromo-2-methoxymethyl-1-(2-trimethylsilylethoxymethyl)-1H-pyrrol-3-carboxylate

2,3-dibromo-1-(2-trimethylsilylethoxymethyl)-1,5-dihydropyrrolo[2,3-d]pyridazin-4-one

2-bromo-1-(2-trimethylsilylethoxymethyl)-1,5-dihydropyrrolo[2,3-d]-pyridazin-4-one