Abstract: A fluoropolyether group-containing compound of formula (1a) or formula (1b): wherein RF1, RF2, R1 and R2 are as defined herein.

Abstract: A fluoropolyether group-containing silane compound of the formula (1a) or the formula (1b), the symbols of which are as defined herein: RF1—XA—RSi ??(1a) RSi—XA—RF2—XA—RSi ??(1b)

Abstract: The present disclosure aims to provide an anti-hepatitis B virus agent, and a prophylactic or therapeutic agent for a hepatitis B virus-related disease, each comprising a nucleic acid analogue as an active ingredient. The above object can be attained by an anti-hepatitis B virus agent, or a prophylactic or therapeutic agent for a hepatitis B virus-related disease, each comprising, as an active ingredient, a compound represented by the following formula (1): wherein R is a halogen atom, an amino group, a methoxy group, or a cyano group, or its prodrug, or a pharmaceutically acceptable salt thereof, or a solvate thereof.

Abstract: The present invention provides a compound represented by formula (1) (wherein each of X1 and X2 independently represents —OR1, —NR2R3 or —CR4R5R6 or the like, each of R1, R2, R3, R4, R5 and R6 independently represents an unsubstituted or substituent-bearing glycosyl group or an unsubstituted or substituent-bearing C1 to C30 alkyl group or the like, and A represents an unsubstituted or substituent-bearing C1 to C30 alkyl group or the like) or a salt thereof.