"2-tert-Butyl 4-ethyl 5-amino-3-methylthiophene-2,4-dicarboxylate "
"2-tert-Butyl 4-ethyl 5-amino-3-methylthiophene-2,4-dicarboxylate "
"2-tert-Butyl 4-ethyl 5-amino-3-methylthiophene-2,4-dicarboxylate "
"2-tert-Butyl 4-ethyl 5-amino-3-methylthiophene-2,4-dicarboxylate "