How to rollback committed data from flashback?

To Check
SQL>
SELECT *
  FROM HR.EMPLOYEES
       AS OF TIMESTAMP TO_TIMESTAMP ('2016-12-19 21:35:00', 'YYYY-MM-DD HH24:MI:SS')

To Save Data As Temp Table
SQL>
CREATE TABLE HR.EMPLOYEES_TEMP AS
SELECT *
  FROM HR.EMPLOYEES
       AS OF TIMESTAMP TO_TIMESTAMP ('2016-12-19 21:35:00', 'YYYY-MM-DD HH24:MI:SS')
-- WHERE EMPLOYEE_ID = 100