Table 1: Important HMBC interactions in compound 7; 1H and 13C chemical shifts (δ/ppm) in DMSO- as the solvent (25°C).

Compound 7Compound 7
C atomδ13CHMBC (H → C)C atomδ13CHMBC (H → C)

7129.6H-8 (8.32)9a′′130.5H-8′′ (8.59), H-7′′ (8.27), H-6′′ (7.97)
9126.8H-1 (7.67)1′′′115.4H-9′′′ (8.83), H-1′′′ (7.58)
9a131.6H-1 (7.67)3′′′135.8H-9′′′ (8.83), H-7′′′ (8.15), H-1′′′ (7.58)
9b157.2H-8 (8.32), H-6 (7.99)4′′′164.2H-7′′′ (8.15)
1′′115.3H-1′′ (7.50)5a′′′155.3H-9′′′ (8.83), H-7′′′ (8.15)
5a′′155.4H-6′′ (7.97)6′′′117.6H-7′′′ (8.15)
7′′129.4H-9′′ (9.01), H-6′′ (7.97)9′′′127.6H-8′′′ (8.46), H-1′′′ (7.58)
8′′125.8H-8′′ (8.59)9a′′′129.7H-1′′′ (7.58)
9′′127.6H-1′′ (7.50)