The method 1 wherein said {HEAD ~ alkanolamine} is selected from {TAIL ~ the group} consisting of ethanolamine and propanolamine 
is selected from
The method 1 wherein said { HEAD ~ alkanolamine } is selected from { TAIL ~ the group } consisting of ethanolamine and propanolamine
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH