Typically, these two properties belong to different portions of {HEAD ~ the labeling agent} wherein {TAIL ~ the two portions} are chemically coupled together 
Typically , these two properties belong to different portions of { HEAD ~ the labeling agent } wherein { TAIL ~ the two portions } are chemically coupled together
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH