Table 1 13 C in Gossypolhemiquinone, a dimeric sesquiterpenoid identified in cotton (Gossypium)

Table 1 13 C chemical shifts for gossypolhemiquinone (GHQ) (9) compared to the dimeric sesquiterpenoids gossypol (Goss) (1) and gossypolone (GQ) (2) (for specific carbon assignments refer to Fig. 1).
C#Goss (1)GHQ (9)C#GQ (2)GHQ (9)δδδδ1150.4150.216186.5186.7 a2115.8115.617147.2b149.03133.7131.618138.1b140.34118.1117.919184.4186.8a5134.1133.820141.5141.46143.4143.421149.4149.47156.0156.022152.4152.38111.7111.823115.9115.69114.6117.324126.7127.210129.6129.425127.6127.51127.827.826198.5197.91220.220.12714.814.61320.220.32828.728.814199.3199.32919.720.01520.320.83019.619.7
a Assignments may be interchanged.
b Assignments are based on that in GHQ; in the HMBC experiment, no coupling was shown between the protons on C-27 with either C-17 or C-18.