Jan 01, 2011 · Dichloran Rose Bengal Chloramphenicol (DRBC) agar. Dissolve 10 g glucose, 5 g peptone, 1 g KH 2 PO 4 , 0.5 g MgSO 4· 7H 2 O, 0.025 g Rose Bengal, 0.002 g dichloran, 0.1 g chloramphenicol and 15 g agar in 1 liter of deionized water and sterilize by autoclaving at 121°C for 15 min. Chloramphenicol can be added before autoclaving.