SUBSTITUTED AMINOTHIAZINE DERIVATIVE

摘要

Disclosed is a a therapeutic or prophylactic agent for diseases induced by the production, secretion and/or deposition of amyloid-ß protein. Specifically disclosed is a compound represented by formula (I) (wherein R1, R2a, R2b, R3, R4a, R4b, ring A and the dotted line are as defined in the description), a pharmaceutically acceptable salt of the compound, or a solvate of the compound or the pharmaceutically acceptable salt.