{HEAD ~ The active ester} is conjugated to an immunogenic carrier containing a primary amine to form the immunogen having, at least, the immunological specificity of {TAIL ~ the organic compound} and the immunogenicity of the carrier 
{ HEAD ~ The active ester } is conjugated to an immunogenic carrier containing a primary amine to form the immunogen having , at least , the immunological specificity of { TAIL ~ the organic compound } and the immunogenicity of the carrier
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH