Figure 9.

The two reaction steps leading from (+)-2endo-hydroxy-1,8-cineole to (R, R)-1,6,6-trimethyl-2,7-dioxobicyclo-[3.2.2]nonan-3-one in the BioMeta, KEGG (entries R02994 and R02995), and Brenda databases. Incorrectly positioned oxygen groups are indicated by red arrows. Note that the structures from both KEGG and Brenda lack stereochemistry.