tokens: Eslicarbazepine acetate ( BIA 2 - 093 , S - ( - ) - 10 - acetoxy - 10 , 11 - dihydro - 5H - dibenzo / b , f / azepine - 5 - carboxamide ) is a novel antiepileptic drug , now in Phase III clinical trials , designed with the aim of improving efficacy and safety in comparison with the structurally related drugs carbamazepine ( CBZ ) and oxcarbazepine ( OXC ) .