Abstract
During the investigations of the effect of indoline-derivatives on the smooth muscle have been continued, we have discovered that 1-methyl-5-chloroindoline methylbromide (hereafter referred to as S-6) well contracts the isolated ileum of guinea pig. Thus, the mode of action of S-6 on the guinea pig ileum has been investigated under various conditions. The aim of this paper is to show that S-6 contracts the isolated ileum of the guinea pig possibly by acting on acetylcholine receptor directly.
