| 摘要 |
<p>A compound represented by the following formula (I), a salt thereof or a hydrate of the foregoing is useful for treating esophageal cancer. [R1 represents a 3- to 10-membered non-aromatic heterocyclic group or the like; R2 and R3 represent hydrogen; R4, R5, R6, and R7 may be the same or different and each represents hydrogen, halogen, C1-6 alkyl or the like; R8 represents hydrogen or the like; R9 represents a 3- to 10-membered non- aromatic heterocyclic group or the like; n represents an integer of 1 or 2; X represents -CH=, nitrogen or the like.]</p> |
