The present invention relates to a carbon dioxide absorbent. In particular, the present invention relates to a carbon dioxide absorbent comprising an ionic liquid, amine and glycol. Since the carbon dioxide absorbent of the present invention can retain excellent CO
2
absorption capacity despite repetitive regenerations at low temperature, it can reduce energy consumption and a loss of absorbents used, and therefore, can be effectively used for a process of collecting carbon dioxide from exhaust gas and natural gas and separating the same.
The present invention provides compounds of formula (I) (Formula (I)) and pharmaceutically acceptable salts thereof, wherein Q, X % X4, X5 X6, X7, R1, R2, R3 and R8 are as defined in the specification, processes for the preparation of such compounds, pharmaceutical compositions containing them and the use of such compounds in therapy.