1-thieno[2,3-d]pyridazin-7-yl-semicarbazide

7-hydrazino-thieno[2,3-d]pyridazine

thieno[2,3-d]pyridazin-7-ylamine

7-benzylsulfanyl-thieno[2,3-d]pyridazine

propan-2-one thieno[2,3-d]pyridazin-7-yl-hydrazone