Ethyl 2-benzyloxy-4-[N-{1-(2-piperidino-phenyl)-1-butyl}-aminocarbonylmethyl]-benzoate → Ethyl 2-ethoxy-4-[N-(1-(2-piperidino-phenyl)-3-methyl-2-buten-1-yl)-aminocarbonylmethyl]-benzoate

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The mixing ratio of 75/25 is obtained from the corresponding ratio of intensities of the particularly characteristic signals in the 400 MHz-1H-NMR spectrum (CDCl3). The position of the signals is: 3-methyl-2-buten-1-yl compound: olefinic H: 5.25 (d), CH3 : 1.64 (s) and 1.77 (s). benzylic ##STR18## 6.00 (t), benzylic CH2 --; 3.52 ppm (s) 3-methyl-1-butyl compound: CH3 : 0.90 (d), benzylic ##STR19## 5.35 (m), benzylic --CH2 --: 3.54 ppm (s).

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