[CH2:1]([NH:4][C:5]([NH:7][CH2:8][CH2:9][CH3:10])=[O:6])[CH2:2][CH3:3].[C:11]([OH:17])(=O)[CH2:12][C:13]([OH:15])=O.C(OC(=O)C)(=O)C>C(O)(=O)C>[CH2:1]([N:4]1[C:11](=[O:17])[CH2:12][C:13](=[O:15])[N:7]([CH2:8][CH2:9][CH3:10])[C:5]1=[O:6])[CH2:2][CH3:3]Synthesis was carried out according to the procedure of Goldner, Ann. Chem., 691, 142 (1966) using 1,3-di-n-propylurea (777 g., 5.38 mole), malonic acid (660 g., 6.34 mole), glacial acetic acid (1050 ml.) and acetic anhydride (2160 ml.) to obtain 790 g. (69.2%) of product, melting point 77° - 80° C. NMR and IR spectra were consistent with the assigned structure.
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