Fig. 5.

¹³C incorporation in aromatic side-chains using a combined glucose erythrose approach. Incorporation from glucose only is shown in black, incorporation from erythrose only in blue, labeling from both erythrose and glucose in red. a Shows results from 1 to ¹³C₁-glucose and 2-¹³C₁-erythrose, b from 2 to ¹³C₁-glucose and 3-¹³C₁-erythrose. All ¹³C labeled positions are isolated, no signs from ¹³C-¹³C couplings could be detected. * represents an averaged signal of position 1 and 2 because of fast exchange of the aromatic rings on the NMR time scale