Complex comprises alpha -cyclodextrin and a halogenated ether (at least 3 wt.% of total weight of the complex). An independent claim is also included for preparing the above complex, comprising (a) preparing an aqueous solution of alpha -cyclodextrin, (b) adding the halogenated ether to the aqueous solution, and (c) separating the precipitated complex. ACTIVITY : Anesthetic. No biological data given. MECHANISM OF ACTION : None given.본 발명은 할로겐화된 에테르의 함량이 복합체의 총 중량의 3 중량% 이상인 것을 특징으로 하는, α-시클로덱스트린 및 할로겐화된 에테르로 제조된 복합체에 관한 것이다.