a quantitative selected-ion monitoring method for the determination of plasma concentrations of the new potent antiallergic agent , 4- ( p-chlorobenzyl ) -2- ( hexahydro-1-methyl-1h-azepin-4-yl ) -1- ( 2h ) -phthalazinone hydrochloride ( azelastine hydrochloride , a 5610 ) , using n-methyl deuterium labelled azelastine as the internal standard , has been developed .
C0771004
azelastine hydrochloride
C0052762
internal