public_sql_20/table_descriptions.csv

table_name,table_description
molecule,"Stores one record per molecule with a unique text ID, its assessment outcome code, and the date it was registered in the program. Each molecule undergoes a screening process and receives a classification code."
bond,"The bond table stores one record per chemical bond within a molecule, with bond_id (TRxxx_A1_A2) encoding the molecule and the two atoms involved. It links to the molecule via molecule_id and specifies bond order through bond_type (- single, = double, # triple)."
connected,"Represents molecular bonds by linking two atom identifiers (atom_id and atom_id2) with a bond identifier (bond_id), enabling reconstruction of atom-to-atom connectivity. All fields are text IDs used to reference atoms and their connecting bond."
atom,"This table stores one record per atom, with a unique atom_id, the molecule_id of its parent molecule (atom IDs often follow TRXXX_i for the ith atom of molecule TRXXX), and the atom's chemical element. Element values use standard symbols (e.g., C, H, O, N, S, Cl, P, Na, Br, F, I, Sn, Pb, Te, Ca)."