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C17H22N2O2\text{C}_{17}\text{H}_{22}\text{N}_2\text{O}_2C17H22N2O2
C18H23NO3\text{C}_{18}\text{H}_{23}\text{NO}_3C18H23NO3
C17H21NO4\text{C}_{17}\text{H}_{21}\text{NO}_4C17H21NO4
C17H21N2O3\text{C}_{17}\text{H}_{21}\text{N}_2\text{O}_3C17H21N2O3