. . "Nucleic Acid, Nucleoside, or Nucleotide"^^ . "Pharmacologic Substance"^^ . "_4-3-Ethylureido_Cytosine"^^ . "4-(3-Ethylureido)-Cytosine"^^ . "4-(3-Ethylureido)-CytosinePTNCI" . "4-(3-Ethylureido)-Cytosine"^^ . "C1521331"^^ . "A ureido-derivative of pyrimidine developed to induce leukemic cell differentiation. This agent has been shown to induce erythroleukemia cell differentiation. (NCI04)NCI" . "C1997"^^ .