text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_name_7 (formula VARCHAR, chemical_class VARCHAR)
  ### Question:
  Which formula has thial as a chemical class?
  ### Answer:
  SELECT formula FROM table_name_7 WHERE chemical_class = "thial"