Pyrazole-oxazolidinone compound for anti-hepatitis B virus

A compound having formula I, or a pharmaceutically acceptable salt or enantiomer or tautomer thereof:

• wherein:
• each of R1, R2 and R3 is independently selected from hydrogen, halogen, optionally substituted alkyl, amino and hydroxyl;
• R4 and R5, together with the carbon atoms to which they are attached, form an optionally substituted five-membered heterocyclic or heteroaryl group containing at least one nitrogen atom, wherein —CH2— in the heterocyclic group is optionally replaced by —C(═O)—, —C(═S)—, or —C(═NH)—;
• R6is selected from deuterium, halogen, amino and hydroxyl;
• n is 0, 1 or 2;
• and
• Q is aryl or heteroaryl, wherein the aryl or heteroaryl is optionally substituted with one or more halogens.