| abstract |
Novel compounds below are useful for preventing or treating diseases caused by protozoans. At least one of a compound represented by Formula (I) n n(wherein, X represents a hydrogen atom or a halogen atom; R 1 represents a hydrogen atom; R 2 represents a hydrogen atom or a C 1-7 alkyl group; R 3 represents —CHO, —C(═O)R 5 , —COOR 5 (wherein R 5 represents a C 1-7 alkyl group), —CH 2 OH or —COOH; and R 4 represents a C 1-16 alkyl group having one or more substituents on a terminal carbon atom and/or non-terminal carbon atom(s), a C 2-16 alkenyl group having one or more substituents on a terminal carbon atom and/or non-terminal carbon atom(s), or a C 2-16 alkynyl group having one or more substituents on a terminal carbon atom and/or non-terminal carbon atom(s)), an optical isomer thereof, and a pharmaceutically acceptable salt is used. |