4-Thiochromanyl-O,O-dimethyl dithiophosphate 41219-25-4 Phosphorodithioic acid, S-(3,4-dihydro-2H-1-benzothiopyran-4-yl) O,O-dimethyl ester S-(3,4-Dihydro-2H-1-benzothiopyran-4-yl) O,O-dimethyl phosphorodithioate