SEARCH Articles Figures Tables 2- Amino-3-ethoxycarbonyl-4- 3,4-dihydro 3- Amino-2-ethoxycarbonyl-5-hydroxypyrazine 4 -ethoxycarbonyl 4- Amino-5-ethoxycarbonyl-2-methyl 4-Amino-5-ethoxycarbonyl-1 -phenyl 5- Amino-2-benzoyl-4-ethoxycarbonyl Ethoxycarbonylation Imidazole 4- amino-5-ethoxycarbonyl