THE PRESENT INTENTION PROVIDES COMPOUNDS REPRESENTED BY FORMULA (IV) (IN THE FORMULA R IS A PROTECTING GROUP OF AN AMINO GROUP AND R AND R ARE EACH INDEPENDENTLY A PROTECTING GROUP OF A CARBOXY GROUP) PHARMACEUTICALLY ACCEPTABLE SALTS THEREOF SOLVATES THEREOF OR CRYSTALS THEREOF A PRODUCTION METHOD THEREOF AND A USEFUL NEW METHOD FOR PRODUCING CEPHEM COMPOUNDS USING FORMULA (IV).