The present invention pertains to a compound having an excellent blood sugar lowering effect, or a pharmaceutically-acceptable salt thereof. A compound represented by general formula (I), or a pharmaceutically-acceptable salt thereof. [In the formula: R1 represents a C1-C3 alkyl group R2 represents the same or different C1-C3 alkyl group R3 represents an optionally-substituted pyridyl group or the like R4 and R5 are the same or different, and each represent a C1-C3 alkyl group R6 and R7 are the same or different, and each represent a C1-C3 alkyl group and n represents 0 to 3].本發明之課題係關於具有優異的降血糖作用之化合物或其藥理學上可容許的鹽。其解決手段為一種下述通式(I)化合物或其藥理學上可容許的鹽:[式中,R1表示C1-C3烷基,R2表示相同或相異之C1-C3烷基,R3表示可經取代的吡啶基,R4及R5各自表示相同或相異之C1-C3烷基,R6及R7各自表示相同或相異之C1-C3烷基,n表示0~3]。
