Preferred Definitions:    R1=aromatic group;    R2+R3=5 or 6-membered saturated ring;and    R4=hydroxy or dialkyl substituted amino.    SPECIFIC COMPOUNDS - 18 Benzothiazole-containing compounds (1) are disclosed, e.g. 2-(2-(2-(4-(4-methoxyphenyl)-1H,2H,3H,3aH,4H,8bH-cyclopenta(b)indol-8-yl)ethenyl)-6-methyl-2,3-dihydro-1,3-benzothiazol-3-yl)acetic acid bromide of formula (A), 2-(2-(2-(4-(4-(2,2-diphenylethenyl)phenyl)-1H,2H,3H,3aH,4H,8bH-cyclopenta(b)indol-8-yl)ethenyl)-6-ethyl-2,3-dihydro-1,3-benzothiazol-3-yl)acetic acid bromide, 2-(2-(2-(4-(4-(2,2-diphenylethenyl)phenyl)-1H,2H,3H,3aH,4H,8bH-cyclopenta(b)indol-8-yl)ethenyl)-6-methoxy-2,3-dihydro-1,3-benzothiazol-3-yl)acetic acid bromide, 2-(2-(2-(4-(4-(2,2-diphenylethenyl)phenyl)-1H,2H,3H,3aH,4H,8bH-cyclopenta(b)indol-8-yl)ethenyl)-6-ethoxy-2,3-dihydro-1,3-benzothiazol-3-yl)acetic acid bromide and 2-(2-(2-(4-(4-(2,2-diphenylethenyl)phenyl)-1H,2H,3H,3aH,4H,8bH-cyclopenta(b)indol-8-yl)ethenyl)-6-ethoxy-2,3-dihydro-1,3-benzothiazol-3-yl)acetic acid bromide.    EXAMPLE - Nippon Aerosil P-25 (RTM: titanium dioxide) (in g) (2), acetylacetone (0.2), Triton X-100 (RTM: surfactant) (0.3) and water (6.5) were added, stirred for 6 hours, concentrated nitric acid (0.2 ml), ethanol (0.4 ml) and polyethylene glycol (#20000) (1.2) were added into the dispersion liquid, and the obtained paste was coated on glass substrate, dried at room temperature for 1 hour and baked at 100-550 degrees C for 1 hour, to obtain semiconductor electrode. 3-Ethyl-2-(2-(4-(4-methoxyphenyl)-1H,2H,3H,3aH,4H,8bH-cyclopenta(b)indol-8-yl)ethenyl)-6-methyl-2,3-dihydro-1,3-benzothiazole bromide was dissolved in mixed solution containing t-butyl alcohol/acetonitrile, to obtain dye solution having concentration of 0.3 mM. 3-((2S,5R,9R,15R,16S)-5,9,16-trihydroxy-2,15-dimethyltetracycloheptadecan-14-yl)butanoic acid was dissolved in the dye solution having concentration of 0.6 mM. The semiconductor electrode was immersed into the dye solution, and adsorption was carried out at room temperature for 3 hours, to obtain photoelectric conversion component.