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RCOOR’
R:H or hydrocarbon
R’: là gốc hydrocarbon
-COO-(1bi ,2O)
Ester no ,đơn ,hở
CnH2nO2(n>=2)
Ester ko no
Chứa 1 nối đôi C=C
Đơn chức mạch hở
CnH2n-2O2(n>=3)
Mùi dứa
C2h5COOc2h5
C3H5COOC2H5