The present invention provides a compound represented by the formula
wherein A represents (1) a bond, (2) a group represented by the formula —CR
a
═CR
b
— (R
a
and R
b
each represent a hydrogen atom or C
1-6
alkyl) and the like; R
1
represents (1) cyano or (2) an optionally esterified or amidated carboxyl group; R
2
represents (1) a hydrogen atom, (2) an optionally substituted hydroxy group, (3) an optionally substituted amino group and the like; R
3
and R
4
each represent a hydrogen atom and the like; R
5
represents a hydrogen atom and the like; R
6
represents an optionally substituted hydroxy group and the like; R
7
and R
8
each represent an optionally substituted hydrocarbon group and the like; R
9
and R
10
each represent (1) a hydrogen atom and the like; Y represents an optionally substituted methylene group; and n represents 0 or 1, or a salt thereof, which has an excellent phosphodiesterase IV inhibiting action.
The present invention provides a compound represented by the formula
wherein A represents (1) a bond, (2) a group represented by the formula -CRa=CRb- (Ra and Rb each represent a hydrogen atom or C1-6 alkyl) and the like; R1 represents (1) cyano or (2) an optionally esterified or amidated carboxyl group; R2 represents
(1) a hydrogen atom, (2) an optionally substituted hydroxy group,
(3) an optionally substituted amino group and the like; R3 and R4 each represent a hydrogen atom and the like; R5 represents a hydrogen atom and the like; R6 represents an optionally substituted hydroxy group and the like; R7and R8 each represent an optionally substituted hydrocarbon group and the like; R9 and R10 each represent (1) a hydrogen atom and the like; Y represents an optionally substituted methylene group; and n represents 0 or 1, or a salt thereof, which has an excellent phosphodiesterase IV inhibiting action.