.alpha.-(4-Chlorophenoxy)propionic acid 2-(4-CPP) 2-(4-Chlorophenoxy)propionic acid 2-(p-Chlorophenoxy)propionic acid 3307-39-9 4-CPP NSC70174 Propanoic acid, 2-(4-chlorophenoxy)- Propionic acid, 2-(p-chlorophenoxy)-