25537-46-6 AI3-25819 BAY 46676 Bayer 46676 ENT 25,819 Phosphonic acid, ethyl, O-ethyl O-(2-(ethylthio)-6-methyl-4-pyrimidinyl) ester Phosphonic acid, ethyl-, ethyl 2-(ethylthio)-6-methyl-4-pyrimidinyl ester (9CI)