Yeast Extract Glucose Chloramphenicol Agar Difco 219001, 500g. Selective agar, recommended by the International Dairy Federation for the enumeration of yeasts and molds. Yeast Extract Glucose Chloramphenicol Agar Difco 219001 - buy online through Voigt Global Distribution, your dealer distributor for all BBL DIFCO BD Microbiology products.