CREATE TABLE table_56824 ("Chemical class" CLOB, "Group" CLOB, "Formula" CLOB, "Prefix" CLOB, "Suffix" CLOB)

Which formula has a thial as a chemical class?
SELECT "Formula" FROM table_56824 WHERE "Chemical class" = 'thial'
SELECT "Formula" FROM "table_56824" WHERE "Chemical class" = 'thial'