(2R,3R)-2,3-Bis(acetyloxy)-butanedioic Acid Mono[(10R)-5-(aminocarbonyl)-10,11-dihydro-5H-dibenz[b,f]azepin-10-yl] Ester is a by-product intermediate in synthesizing (S)-10-Monohydroxy-10,11-dihydro Carbamazepine (M546510). It is the metabolite of Eslicarbazepine acetate, (BIA 2-093), (E659000) a novel central nervous system drug.