Cyclosporin H 

Chemical Name: Cyclosporin H ; 5-(N-Methyl-D-Valine) Cyclosporin A ; Cyclo[L-alanyl-D-alanyl-N-methyl-L-leucyl-N-methyl-L-leucyl-N-methyl-D-valyl-3-hydroxy-N,4-dimethyl-L-2-amino-6-octenoyl-L-2-aminobutanoyl-N-methylglycyl-N-methyl-L-leucyl-L-valyl-N-methyl-L-leucyl] ;

Synonym: Entecavir (R,R,R)-Isomer ; 2-amino-9-((1R,3R,4R)-4-hydroxy-3-(hydroxymethyl)-2-methylenecyclopentyl)-1,9-dihydro-6H-purin-6-on

Smile: O[C@@H]([C@](C(N[C@H](C(N(CC(N([C@H](C(N[C@@](C(N([C@H]1CC(C)C)C)=O)([H])C(C)C)=O)CC(C)C)C)=O)C)=O)CC)=O)([H])N(C([C@@](N(C([C@@H](N(C([C@](N(C([C@H](NC([C@@H](NC1=O)C)=O)C)=O)C)([H])CC(C)C)=O)C)CC(C)C)=O)C)([H])C(C)C)=O)C)[C@H](C)C/C=C/C