[CH:1]1[C:6]2[CH:7]=[C:8]3[C:22](=[O:23])[O:21][CH2:20][C:9]3=[C:10]([C:11]3[CH:12]=[CH:13][C:14]4[O:19][CH2:18][O:17][C:15]=4[CH:16]=3)[C:5]=2[C:4]2[O:24][CH2:25][O:26][C:3]=2[CH:2]=1.[CH3:27][NH2:28]>C1C=CC=CC=1>[CH3:27][NH:28][C:22]([C:8]1[CH:7]=[C:6]2[C:5](=[C:10]([C:11]3[CH:12]=[CH:13][C:14]4[O:19][CH2:18][O:17][C:15]=4[CH:16]=3)[C:9]=1[CH2:20][OH:21])[C:4]1[O:24][CH2:25][O:26][C:3]=1[CH:2]=[CH:1]2)=[O:23]Helioxanthin (1.0 g) was suspended in benzene (10 ml), followed by addition of methylamine (40% methanol solution: 2 ml). The mixture was heated at 120° C. under stirring for 4 days. The reaction mixture was concentrated under reduced pressure. The resulting residue was recrystalized from DMF to yield the title compound (144 mg).
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