[CH3:1][NH:2][N:3]=[CH:4][C:5](=[O:7])[CH3:6].[CH3:8][C:9]1[CH:10]=[C:11]([C:16](=O)[CH:17]=[O:18])[CH:12]=[C:13]([CH3:15])[CH:14]=1.CCCCCC.C(OCC)(=O)C>C(O)(=O)C>[CH3:8][C:9]1[CH:10]=[C:11]([C:16]2[N:2]([CH3:1])[N:3]=[C:4]([C:5](=[O:7])[CH3:6])[C:17]=2[OH:18])[CH:12]=[C:13]([CH3:15])[CH:14]=12-Oxopropanal methylhydrazone (7.29 mmol, 730 mg) and (3,5-dimethylphenyl)(oxo)acetaldehyde (7.29 mmol, 1.18 g) synthesized in Reference Synthetic Example 10 were dissolved in acetic acid (25 mL) and stirred at 100° C. for 5 hours. Then, the solvent was evaporated, and the residue was dried by means of a vacuum pump and purified by silica gel column chromatography (n-hexane/ethyl acetate=3/1) and then by silica gel thin layer chromatography (n-hexane/ethyl acetate=3/1) to give the desired product as an orange liquid (93 mg, yield 5%).
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