[CH2:1]([O:3][CH2:4][C:5]([OH:7])=O)[CH3:2].C(OCC([Cl:14])=O)C.[CH3:15][N+:16]([CH2:19][CH:20]([OH:25])[CH2:21][C:22]([O-:24])=[O:23])([CH3:18])[CH3:17]>COC(C)(C)C>[CH2:1]([O:3][CH2:4][C:5]([C:20]([CH2:21][C:22](=[O:23])[O-:24])([CH2:19][N+:16]([CH3:15])([CH3:17])[CH3:18])[OH:25])=[O:7])[CH3:2].[Cl-:14]A mixture of ethoxy acetic acid (5 ml; 0.07 moles) and ethoxyacetyl chloride (1.8 ml; 0.015 moles) which had been prepared as disclosed in step (b) of Example 5, was kept under stirring for 2 hours at 80° C. To this mixture carnitine chloride (2 g; 0.01 moles) which had been previously dried was added. The resulting mixture was first kept at 80° C. until complete dissolution of carnitine took place, then at 40° C. for eight days. A further amount of ethoxyacetyl chloride (0.9 ml; 0.007 moles) was added and the resulting mixture was kept at 40° C. for seven days. Upon addition to the mixture of tert-butyl methyl ether an oil precipitated. The oil precipitation was repeated four times with acetonitrile/tert butyl methyl ether until complete removal of the ethoxyacetic acid in excess. 1.5 grams of the title compound were thus obtained. Yield: 75%
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