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_33 (chemical_class VARCHAR, formula VARCHAR)
  ### Question:
  What is the chemical class for ri?
  ### Answer:
  SELECT chemical_class FROM table_name_33 WHERE formula = "ri"