In {TAIL ~ terms} of a chemical reaction, {HEAD ~ the following representational scheme} summarizes the method of the present invention: 
In
In { TAIL ~ terms } of a chemical reaction , { HEAD ~ the following representational scheme } summarizes the method of the present invention :
REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH