R7 is OH, lower alkyl, {TAIL ~ phenyl}, benzyl, R3 phenyl or {HEAD ~ R3 benzyl} 
R7 is OH , lower alkyl , { TAIL ~ phenyl } , benzyl , R3 phenyl or { HEAD ~ R3 benzyl }
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD