The present invention discloses compounds of Formula , or {HEAD ~ pharmaceutically acceptable salts}, {TAIL ~ esters}, or prodrugs thereof: 
The present invention discloses compounds of Formula , or { HEAD ~ pharmaceutically acceptable salts } , { TAIL ~ esters } , or prodrugs thereof :
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH