c1cc(ccc1C[C@@H](C(=O)NS(=O)(=O)OC[C@@H]2[C@H]([C@H]([C@@H](O2)n3cnc4c3ncnc4N)O)O)N)O 5'-O-[N-(L-TYROSYL)SULFAMOYL]ADENOSINE YSA