Thiadiazoline derivative

摘要

(wherein R¹ and R⁴ are the same or different and each represents a hydrogen atom, substituted or unsubstituted lower alkyl, substituted or unsubstituted lower alkynyl, substituted or unsubstituted lower alkenyl, or the like; R⁵ represents a substituted or unsubstituted heterocyclic group, substituted or unsubstituted aryl, or the like; R² represents -C(-W)R⁶ or the like; R³ represents a hydrogen atom, -C(-W^A)R^6A, or the like) Antitumor agents which comprises a thiadiazoline derivative represented by the aforementioned general formula (I) or a pharmacologically acceptable salt thereof as an active ingredient are provided.