loop_ _pdbx_chem_comp_descriptor.comp_id _pdbx_chem_comp_descriptor.descriptor _pdbx_chem_comp_descriptor.type _pdbx_chem_comp_descriptor.program _pdbx_chem_comp_descriptor.program_version ATP c1nc(c2c(n1)n(cn2)C3C(C(C(O3)COP(=O)(O)OP(=O)(O)OP(=O)(O)O)O)O)N SMILES OPENEYE 1.5.0