BrC1(Br)Nc2c(N)ncnc2N1C3OC(C(O)C3O)C(CC4OC(=C(O)C4O)N5C=Nc6c(N)ncnc56)(CC7OC(C(O)C7OP(=O)(O)OP(=O)(O)O)N8C(Br)=Nc9c(N)ncnc89)OP(=O)(O)OP(=O)(O)O