B 6335 (OTTO) 5-Bromovanillin, 97% Cas 2973-76-4 - used to enrich the metabolically stable anaerobic cultures to study dechlorination of chlorocatechols. B 6335 (OTTO) 5-Bromovanillin, 97% Cas 2973-76-4 - used to prepare 2, 5-dihydroxy-4-methoxy-6-bromobenzaldehyde and 5-bromovanillate.