The thioketal product of a certain reaction is given. An organic reactant and protecting group reactant combine under acidic conditions to give a product and water. The product consists of a 5 membered ring where position 1 is fused to a 6 carbon ring, sharing a carbon. Positions 2 and 5 are sulfur atoms. Positions 3 and 4 are C H 2 groups. Identify the organic reactant and the protecting group reactant.