[CH3:1][N:2]([CH2:4][CH2:5][OH:6])[CH3:3].[C:7](=O)([O:12][CH2:13][CH2:14][N:15]([CH3:17])[CH3:16])[O:8]C(C)C>C(O)(C)C>[CH3:1][N:2]([CH2:4][CH2:5][O:6][C:7](=[O:8])[O:12][CH2:13][CH2:14][N:15]([CH3:17])[CH3:16])[CH3:3]wherein the 2-(N,N-dimethylamino)ethanol reacts with the isopropyl 2-dimethylaminoethyl carbonate formed in step ii) to form bis[2-(N,N-dimethylamino)ethyl]carbonate and isopropanol,
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