The product yield can be increased, where appropriate, by {HEAD ~ addition} of {TAIL ~ hydrogen peroxide} 
of
The product yield can be increased , where appropriate , by { HEAD ~ addition } of { TAIL ~ hydrogen peroxide }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL