Preferably, {HEAD ~ the reactive group} is {TAIL ~ hydrogen} are the reactive site is a hydroxy group 
is
Preferably , { HEAD ~ the reactive group } is { TAIL ~ hydrogen } are the reactive site is a hydroxy group
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH