A singlet at d 8.57 ppm was a tropical signal of H-4 in the cyanidin structure. Four doublets
at d 6.61 (J = 2.0 Hz), 6.87 (J = 1.0 Hz), d 8.03 (J = 2.4 Hz) and d 7.05 (J = 8.4 Hz) ppm, respectively, corresponded to H-6, H-8, H-2 0and H-50 of cyanidin. A doublet of doublet at d 8.12 (J = 8.4, 2.0 Hz) ppm corresponded to H-60 as shown in Fig. 1.