{HEAD ~ The compounds} of the invention are fluorophores that are derivatized to allow {TAIL ~ their facile attachment} to another moiety 
{ HEAD ~ The compounds } of the invention are fluorophores that are derivatized to allow { TAIL ~ their facile attachment } to another moiety
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH