Table 2. Optimization of Linker Chain Length for Phenylstatine-Based Inhibitors Bearing 3-Pyridylalanine or Valine Residues in P1′a.

Positions of oxygens in 23, 24, and 26 are indicated with respect to the carbonyl carbon highlighted by arrow.

Positions of oxygens in 23, 24, and 26 are indicated with respect to the carbonyl carbon highlighted by arrow.