Figure 1.
Chemical structure of α-PVP, 3-F-α-PVP, 4-F-α-PVP, 3-Cl-α-PVP, 4-Cl-α-PVP, 3,4-Cl2-α-PVP, 3-Br-α-PVP, and 4-Br-α-PVP.
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