The present invention aims to provide a novel SCD inhibitor.
The present invention relate to SCD inhibitor comprising A compound represented by the formula (I)
wherein
R is an optionally substituted cyclic group or an optionally substituted carbamoyl group, provided that R is not an optionally substituted 7-pyrido[2,3-d]pyrimidyl group;
ring A is an optionally further substituted pyridazine ring;
R
1
, R
2
, R
3
, R
4
, R
11
, R
12
, R
13
and R
14
are each independently a hydrogen atom or a substituent, or R
1
and R
11
in combination, R
2
and R
12
in combination, R
3
and R
13
in combination, or R
4
and R
14
in combination optionally form an oxo group, or R
2
and R
4
in combination optionally form a bond or an alkylene cross-linkage;
m and n are each independently an integer of 0 to 2;
ring B is an optionally substituted ring, provided that the two atoms constituting ring B, which are adjacent to the spiro carbon atom, are not oxygen atoms at the same time, or a salt thereof, or a prodrug thereof.