Indole compound

A compound represented by the formula (I):

• wherein
• R1 is a hydrogen atom or a halogen atom;
• R2 is a group represented by
• wherein
• R6 is a substituted C1-6 alkyl group;
• and
• R7, R21 and R22 are each independently a hydrogen atom, an optionally substituted hydrocarbon group, a cyano group or an acyl group, or R6 and R7 in combination form an optionally substituted ring;
• W is O or NR8 wherein R8 is a hydrogen atom, an optionally substituted C1-6 alkyl group or an optionally substituted C3-10 cyclo alkyl group;
• R3 is an optionally substituted heterocyclic group or an optionally substituted C6-14 aryl group;
• R10 is an optionally substituted C1-6 alkyl group or an optionally substituted C1-6 alkoxy group;
• and
• R9, and R11 are each independently a hydrogen atom, a halogen atom, an optionally substituted C1-6 alkyl group or an optionally substituted C1-6 alkoxy group,
• or a salt thereof.