Abstract: An inhibitor of endothelin action or a skin-whitening agent, comprising a compound represented by Formula (1) or a salt thereof as an active ingredient: wherein in Formula (1), R1 represents a formyl group or an alkyl group having 1 to 4 carbon atom(s), and R2 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atom(s).

Abstract: An inhibitor of endothelin action or a skin-whitening agent, comprising a compound represented by Formula (1) or a salt thereof as an active ingredient. wherein in Formula (1), R1 represents a formyl group or an alkyl group having 1 to 4 carbon atom(s), and R2 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atom(s).

Abstract: An apparatus for recording and/or reproducing a recording medium, for example, an optical disk, a tape cassette or the like, has an apparatus body having an opening in the front surface side thereof, a front panel and a guard plate. The apparatus body includes therein a recording and/or reproducing unit for recording and/or reproducing the recording medium. The recording medium is inserted into the apparatus body or discharged from the apparatus body through the opening. The front panel is rotatively provided at the front surface side of said apparatus body. The front panel is rotated between a first position for closing the opening and a second position for opening the opening. The guard plate projects to a position for covering a portion of the front panel when the front panel has been rotated from the first position to the second position.