| abstract |
The present invention relates to a compound represented by Formula [I]: or a pharmaceutically acceptable salt or ester thereof, wherein R1 and R2, which may be the same or different, are each a hydrogen atom, a halogen atom, a lower alkyl group which may be substituted, or a cyclopropyl group; R3 and R4, which may be the same or different, are each a hydrogen atom, a lower alkyl group substituted with NRaRb, a 4- to 6-membered aliphatic heterocyclic group, a lower alkyl group substituted with a 4- to 6-membered aliphatic heterocyclic group, a 5- or 6-membered aromatic heterocyclic group, or a lower alkyl group substituted with a 5- or 6-membered aromatic heterocyclic group; and R5 is a hydrogen atom, a cyano group, a halogen atom, or a lower alkyl group. |