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Methyl 4-n-boc-morpholine-3-acetate

Methyl 4-n-butoxybenzoate

Methyl 4-nitrobenzenesulfonate

Methyl 4-nitrobutyrate

Methyl 4-n-octyloxybenzoate

Methyl 4-n-pentyloxybenzoate

Methyl 4-n-undecyloxybenzoate

Methyl 4-oxo-4,5,6,7-tetrahydro-1-benzofuran-3-carboxylate

Methyl 4-oxocycloheptanecarboxylate

Methyl 4-phenylbutyrate