Ns. Watson et al., THE SQUALESTATINS - POTENT INHIBITORS OF SQUALENE SYNTHASE - THE ROLEOF THE TRICARBOXYLIC-ACID MOIETY, Bioorganic & medicinal chemistry letters, 3(12), 1993, pp. 2541-2546
In squalestatins possessing at C6 either a 4,6-dimethyloctenoate ester
or a hydroxyl group, the 5-carboxylic acid is crucial for squalene sy
nthase inhibitory activity. In the former series, free carboxylic acid
s are not required at C3 or C4 for potent enzyme inhibitory activity w
hereas in the latter series esterification of the carboxylic acids at
C3 or C4 results in a significant reduction in enzyme inhibitory activ
ity.