1-(2,6-dimethylphenyl)-6,7-dihydro-1H-azepin-2(5H)-one; Bupivacaine EP Impurity C;Levobupivacaine Impurity C ;1-(2,6-Dimethylphenyl)-1,5,6,7-tetrahydro-2H-azepin-2-one;1-(2,6-dimethylphenyl)-6,7-dihydro-1H-azepin-2(5H)-one;1-(2,6-dimethylphenyl)-1,5,6,7-tetrahydro-2H-azepin-2-one;Levobupivacaine EP Impurity C.
