| p-ethyl-n-((5-methoxy-2-pyrimidinyl)carbamoyl)-phosphonamidic aci ethyl est |
| n-monoethoxymonoethylphosphono-n'-5-methoxypyrimidyl-2-urea |
| p-ethyl-n-((5-methoxy-2-pyrimidinyl)carbamoyl)phosphonamidic acid ethyl ester |
| p-ethyl-n-((5-methoxy-2-pyrimidinyl)carbamoyl)-phosphonamidic aci ethyl ester |
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