{TAIL ~ In particular, sulfonated aminocoumarins} that are useful as fluorescent tracing agents and {HEAD ~ enzyme substrates}, reactive derivatives of sulfonated aminocoumarins useful as labels, and their conjugates 
{ TAIL ~ In particular , sulfonated aminocoumarins } that are useful as fluorescent tracing agents and { HEAD ~ enzyme substrates } , reactive derivatives of sulfonated aminocoumarins useful as labels , and their conjugates
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH