C([O:3][C:4]([C:6]1[CH:7]=[C:8]([CH:14]=[CH:15][CH:16]=1)[O:9][CH2:10][C:11]([OH:13])=O)=[O:5])C.[NH2:17][CH2:18][CH:19]([OH:22])[CH2:20][NH2:21]>>[OH:22][CH:19]([CH2:20][NH:21][C:11](=[O:13])[CH2:10][O:9][C:8]1[CH:7]=[C:6]([CH:16]=[CH:15][CH:14]=1)[C:4]([OH:3])=[O:5])[CH2:18][NH:17][C:11](=[O:13])[CH2:10][O:9][C:8]1[CH:7]=[C:6]([CH:16]=[CH:15][CH:14]=1)[C:4]([OH:5])=[O:3]By following the processes described in stages A to C of Example R13, Example R15 is prepared by dimerization of [3-(ethoxycarbonyl)phenoxy]acetic acid with 1,3-diaminopropan-2-ol. A white powder is obtained.
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