The invention relates to FSH receptor antagonist according to general formula I or a pharmaceutically acceptable salt thereof and to a pharmaceutical composition containing the same. In one illustrative embodiment, the stretcher apparatus includes a head unit to engage a portion of a web of carpet, frame side members spaced laterally of the head unit that extend from the rear of the head unit past the front end of the head unit, and floor engaging anchors coupled to the frame side members proximal to the front portion. A user operates a phase adjustment knob 64 while watching a display 54 to adjust a phase relationship between an external reference video signal and a video signal under test. A subject image input section 3 is supplied with a simple subject image representing only the subject.