2-benzhydryloxy-N-methylethanamine;hydrochloride; 2-(Diphenylmethoxy)-N-methylethanamine hydrochloride (as per EP) ; 2-(Diphenylmethoxy)-N-methylethanamine hydrochloride (as per USP); Diphenhydramine USP Related Compound A ; N-Desmethyl diphenhydramine hydrochloride; N-Desmethyl Diphenhydramine Hydrochloride