The compound 4, wherein R3 is 5 methylisoxazol 3 yl and {HEAD ~ T} is {TAIL ~ a covalent bond}, namely 2 5 tetrahydrofuran 3,4 diol 
is
The compound 4 , wherein R3 is 5 methylisoxazol 3 yl and { HEAD ~ T } is { TAIL ~ a covalent bond } , namely 2 5 tetrahydrofuran 3,4 diol
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH