4-Bromobenzaldehyde-13C6 is labelled 4-Bromobenzaldehyde (B680325) which is part of a group of benzaldehydes that have in vivo antibacterial activity against Mycobacterium tuburculosis. 4-Bromobenzaldehyde is also used as a reagent in the synthesis of 4-Bromobenzaldehyde semicarbazone, a trial compound of a novel class of anticonvulsants.