Abstract: A compound represented by formula (I): [wherein, for example, X is a hydrogen atom or a halogen atom; R1 is a hydrogen atom; R2 is a hydrogen atom or a C1-4 alkyl group; R3 is —CHO or —COOH; and R4 is —CH?CH—(CH2)p—CH3 (wherein p is an integer of 1 to 12), —CH(OH)—(CH2)q—CH3 (wherein q is an integer of 1 to 13), —CH(OH)—CH2—CH(CH3)—(CH2)2—CH?C(CH3)2, —CH?CH—CH(CH3)—(CH2)3—CH(CH3)2, —(CH2)2—CH(CH3)—(CH2)3—CH(CH3)2 or —(CH2)8—CH3], an optical isomer thereof and a pharmaceutically acceptable salt thereof. These compounds have antitrypanosoma activity, and accordingly are useful as drugs for preventing or treating the diseases caused by trypanosoma.

Abstract: The present invention provides an anti-coronavirus agent including as an active ingredient as exemplified by nelfinavir and salts thereof, an anti-SARS agent including the anti-coronavirus agent, and a method of treating SARS using the anti-SARS agent.

Abstract: A method for the treatment and prevention of herpes zoster using 5-[(E)-2-halogenovinyl]arabinofuranosyl uracil of the following general formula (1): wherein X represents a halogen atom.