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