{TAIL ~ The substrate compound} 3 in which the one or more non proteinaceous fluorescent moiety comprises a dye selected from a xanthene dye, a rhodamine dye, a fluorescein dye, a cyanine dye, {HEAD ~ a phthalocyanine dye}, a squaraine dye and a bodipy dye 
{ TAIL ~ The substrate compound } 3 in which the one or more non proteinaceous fluorescent moiety comprises a dye selected from a xanthene dye , a rhodamine dye , a fluorescein dye , a cyanine dye , { HEAD ~ a phthalocyanine dye } , a squaraine dye and a bodipy dye
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH