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