12A C[C@H]([C@@H](C(=O)O)NC(=O)Nc1c2c(nc(n1)SC)n(cn2)[C@H]3[C@@H]([C@@H]([C@H](O3)COP(=O)(O)O)O)O)O 2-METHYLTHIO-N6-(AMINOCARBONYL-L-THREONYL)-ADENOSINE-5'-MONOPHOSPHATE