More preferably, the compound having active hydrogen is one which contains in the molecule thereof {TAIL ~ both} of an acid group and {HEAD ~ a functional group} having active hydrogen 
More preferably , the compound having active hydrogen is one which contains in the molecule thereof { TAIL ~ both } of an acid group and { HEAD ~ a functional group } having active hydrogen
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH