Disclosed is an arylamidine derivative represented by the following general formula: or a salt thereof, which is useful as an antifungal agent. The canister includes a mouthpieceregulator combination that the user places in his or her mouth and, by depressing a button, a breath of the pure oxygennitrogen is delivered. The flexible layer will maintain the pattern for decoration as the articulated door is cycled. The seamless outer perimeter providing a seamless folded continuity between the two sides of the pad-type filter in the form of a plurality of fold lines which, as connecting segments beginning and ending at the same point, define the seamless outer perimeter.