C1(N=C=NC2CCCCC2)CCCCC1.[CH2:16]([CH:21]([CH:25]([OH:32])[CH2:26][CH2:27][CH2:28][CH2:29][CH2:30][CH3:31])[C:22]([OH:24])=[O:23])[CH2:17][CH2:18][CH2:19][CH3:20].O[N:34]1[C:38](=[O:39])[CH2:37][CH2:36][C:35]1=[O:40]>COCCOC>[CH2:16]([CH:21]([CH:25]([OH:32])[CH2:26][CH2:27][CH2:28][CH2:29][CH2:30][CH3:31])[C:22]([OH:24])=[O:23])[CH2:17][CH2:18][CH2:19][CH3:20].[C:35]1(=[O:40])[NH:34][C:38](=[O:39])[CH2:37][CH2:36]1Dicyclohexylcarbodiimide (27 g) dissolved in 1,2-dimethoxyethane (300 cc) is added, in the course of 40 minutes, to a solution, kept at 0° C., of 2-n-pentyl-3-hydroxynonanoic acid (29.1 g) and N-hydroxysuccinimide (14.1 g) in 1,2-dimethoxyethane (300 cc). The reaction mixture is stirred at 0° C. for 3 hours and then kept at 4° C. for 21 hours. The precipitate formed is filtered off and washed twice with 1,2-dimethoxyethane (100 cc in total). The filtrate is concentrated to dryness under reduced pressure (20 mm Hg) at 50° C. The concentrate is taken up in a mixture of diisopropyl ether (300 cc) and acetic acid (3 cc). After standing for 2 hours at 20° C., the precipitate formed is filtered off and washed twice with diisopropyl ether (40 cc in total). The filtrate is concentrated to dryness under reduced pressure (20 mm Hg) at 50° C. Succinimide 2-n-pentyl-3-hydroxynonanoate (42.6 g) is thus obtained in the form of a yellow oil.
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