102830-69-3 2-(3'-4'-Dichlorophenoxy)-2H-pyrano(2,3-b)pyridine-6-methylsulfone 2H-Pyrano(2,3-b)pyridine, 2-(3,4-dichlorophenyl)-3,4-dihydro-6-(methylsulfonyl)- MDL 20610 Mdl-20,610