英文别名Alcaftadine 3-Carboxylic Acid; 11-(1-methylpiperidin-4-ylidene)-5,6-dihydroimidazo[2,1-b][3]benzazepine-3-carboxylic acid; 6,11-Dihydro-11-(1-methyl-4-piperidinylidene)-5H-Imidazo[2,1-b][3]benzazepine-3-carboxylic Acid; Alcaftadine Impurity 1; 11-(1-Methyl-4-piperidylidene)-5,6-dihydroimidazo[2,1-b][3]benzazepine-3-carboxylic acid; 11-(1-methylpiperidin-4-ylidene)-6,11-dihydro-5h-benzo[d]imidazo[1,2-a]azepine-3-carboxylic acid; 11-(1-Methylpiperidin-4-ylidene)-6,11-dihydro-5H-imidazo[2,1-b][3]benzazepine-3-carboxylic acid 
