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Ethyl 5-methoxy-2-thiophenecarboxylate

Methyl 5-ethoxy-2-thiophenecarboxylate

Ethyl 5-ethoxy-2-thiophenecarboxylate

Methyl 3-(2-pyridyl)propanoate

Ethyl 3-(4-pyridyl)propanoate

Methyl 1-methyl-5-indolecarboxylate

Methyl 1-methyl-4-indolecarboxylate

Ethyl 1-methyl-4-benzimidazolecarboxylate

Ethyl 6-isoquinolinecarboxylate

Ethyl 6-benzoxazolecarboxylate