Building Blocks; Pharmaceutical/API Drug Impurities/Metabolites;
                            
                         
                     
                    
                        
                            
                            
                                4-Phenoxybenzaldehyde is a precursor for para-Cypermethrin (C989400). It can cause acute toxicity to the protozoan ciliate Tetrahymena pyriformis, which is predicted by quantitative structure-active relationship (QSAR) models.