[CH3:1][CH:2]1[CH2:10][C:9]2[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=2)[NH:3]1.C([N:13]([CH2:16]C)CC)C.[C:18]1(C)[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1.ClC(OC1C=CC=CC=1)=[O:27]>O>[CH2:18]([N:3]1[C:4]2[C:9](=[CH:8][CH:7]=[CH:6][CH:5]=2)[CH2:10][C:2]1([C:16]([NH2:13])=[O:27])[CH3:1])[CH2:19][CH2:20][CH2:21][CH2:22][CH3:23]A solution of 0.1 mole of 2-methylindoline, 0.12 mole of triethylamine, 100 ml of toluene and 0.1 mole of phenyl chloroformate is kept at 40° C. for 10 hours and is then cooled to 20° C. and stirred with 250 ml of water for 15 minutes. The toluene phase is separated off, the solvent is evaporated in vacuo, the residue is dissolved in 100 ml of n-hexylamine and this solution is heated under reflux at 130° C. for 6 hours. After cooling, the solvent is evaporated off at 50° C./10 mm Hg and the residue is taken up in 250 ml of toluene. The solution is then extracted successively with 200 ml of 1N sodium hydroxide solution, 200 ml of 1N hydrochloric acid and 200 ml of water. After concentrating the solution, the residue is recrystallised from petroleum ether. N-n-Hexyl-aminocarbonyl-2-methylindoline with a melting point of 57°-59° C. is obtained.
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