26594-06-9 BRN 0820687 N-Monoethoxymonoethylphosphono-N'-5-methoxypyrimidyl-2-urea P-Ethyl-N-((5-methoxy-2-pyrimidinyl)carbamoyl)phosphonamidic acid ethyl ester Phosphonamidic acid, P-ethyl-N-((5-methoxy-2-pyrimidinyl)carbamoyl)-, ethyl ester