U I one flanking Cl EC: two flanking Cl 0 3,4 2,4,6 2,3,4,5 2,3,5,6 Substitution pattern on nonphenol ring Sone flanking Cl ..I~ two flanking Cl 40001 30001 2000- 1000- ~I 03,4 2,4,6 Substitution pattern on 2,3,4,5 2,3,5,6 nonphenol ring Figure 4-4. Decrease in Vmax with addition of second chlorine atom flanking the phenolic group, while keeping the chlorine substitution pattern on the nonphenolic ring constant. A) proximal intestine. B) liver. I