173206-12-7
4-chloro-5-methoxy-2-(tetrahydro-2H-pyran-2-yl)-3(2H)-pyridazinone
→
868662-13-9
5-chloro-6-oxo-1-(tetrahydro-2H-pyran-2-yl)-1,6-dihydropyridazin-4-yl trifluoromethanesulfonate