This invention provides compositions of matter, pharmaceutical compounds, methods of synthesizing such compounds and methods for using such compounds to treat animals infected with a pathogenic mycobacterium. The lead lines may each have a non-straight part where they are bent or deformed into a semi-circular shape such that, when these lead lines are inserted into throughholes prepared through a circuit board, the non-straight parts are hooked at the throughholes and the portions of the lead lines above the circuit board will stand up obliquely. An arcuate contact member is positioned within the body member and circumferential to at least a portion of the conductive pin. The small angle scattered light may be linearly polarized in a direction orthogonal to the direction of the polarization of the forward angle scattered light, and at least both these kinds of light may be detected. The objective optical system guides, to the solid-state imaging device, light returning from the subject which the illumination unit illuminates.