with the exception of an additional hydroxy group attached to carbon C-5′ of the aromatic ring. This was further supported by the molecular ion peak at m/z 384.1213 [M]+ in the HREIMS which indicated the molecular formula of C21H20O7 for 3. The HMBC correlations from H-2″ and H-6″/C-4″, H-2″ and H-5″/C-3″, H-2′/C-3′, C-4′, and C-6′, 3′-OCH3/C-3′, and 3″-OCH3/C-3″ suggested the location of each substituted groups on the two aromatic rings. The connections of seven-carbons in the diarylheptanoid skeleton were confirmed by the HMBC correlations between H-7/C-1″, C-2″, and C-6″, H-2″ and H-6″/C-7, and H-2″, H-5″/C-1″ ( Fig. 2). Therefore, the structure of compound 3 (curcumalongin C) was determined as 1-(4,5-dihydroxy-3-methoxyphenyl)-7-(4-hydroxy-3-methoxyphenyl)-1,6-heptadien-3,5-dione.
with the exception of an additional hydroxy group attached to carbon C-5′ of the aromatic ring. This was further supported by the molecular ion peak at m/z 384.1213 [M]+ in the HREIMS which indicated the molecular formula of C21H20O7 for 3. The HMBC correlations from H-2″ and H-6″/C-4″, H-2″ and H-5″/C-3″, H-2′/C-3′, C-4′, and C-6′, 3′-OCH3/C-3′, and 3″-OCH3/C-3″ suggested the location of each substituted groups on the two aromatic rings. The connections of seven-carbons in the diarylheptanoid skeleton were confirmed by the HMBC correlations between H-7/C-1″, C-2″, and C-6″, H-2″ and H-6″/C-7, and H-2″, H-5″/C-1″ ( Fig. 2). Therefore, the structure of compound 3 (curcumalongin C) was determined as 1-(4,5-dihydroxy-3-methoxyphenyl)-7-(4-hydroxy-3-methoxyphenyl)-1,6-heptadien-3,5-dione.
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