in {TAIL ~ the formula}, {HEAD ~ R0} represents a hydrogen atom or CH3 group, R represents a CH2 group, CH2CH2 group or single bond, X represents a number 0 5 , and R1 is a hydrogen atom or C1 to C20 organic group, 
in
in { TAIL ~ the formula } , { HEAD ~ R0 } represents a hydrogen atom or CH3 group , R represents a CH2 group , CH2CH2 group or single bond , X represents a number 0 5 , and R1 is a hydrogen atom or C1 to C20 organic group ,
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD 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 OTH OTH OTH OTH OTH OTH OTH OTH