The present invention provides a heterocyclic compound having an orexin type 2 receptor agonist activity. A compound represented by the formula (I): wherein each symbol is as described in the specification, or a salt thereof has an orexin type 2 receptor agonist activity, and is useful as an agent for the prophylaxis or treatment of narcolepsy.

##STR00001##

The present invention can provide a salt capable of producing a resist pattern with satisfactory CD uniformity (CDU), and a resist composition. A resist composition comprising a resin including a structural unit having an acid-labile group, an acid generator and a compound represented by formula (I): ##STR00001##
wherein, in formula (I), R.sup.1 represents a hydrocarbon group having 1 to 36 carbon atoms which may have a substituent, X.sup.1 represents *—CO—O—, *—O—CO—, *—O—CO—O— or *—O—, and * represents a bonding site to R.sup.1, L.sup.1 represents a single bond or a hydrocarbon group having 1 to 36 carbon atoms which may have a substituent, and —CH.sub.2— included in the hydrocarbon group may be replaced by —O—, —S—, —CO— or —SO.sub.2—, R.sup.2 represents a saturated hydrocarbon group having 1 to 12 carbon atoms, u1 represents an integer of 0 to 2, s1 represents 1 or 2, t1 represents 0 or 1, in which s1+t1 is 1 or 2, n represents an integer of 2 or more, and a plurality of X.sup.1, L.sup.1, s1, t1, R.sup.2 and u1 each may be the same or different from each other.

The present invention can provide a salt capable of producing a resist pattern with satisfactory CD uniformity (CDU), and a resist composition. A resist composition comprising a resin including a structural unit having an acid-labile group, an acid generator and a compound represented by formula (I): ##STR00001##
wherein, in formula (I), R.sup.1 represents a hydrocarbon group having 1 to 36 carbon atoms which may have a substituent, X.sup.1 represents *—CO—O—, *—O—CO—, *—O—CO—O— or *—O—, and * represents a bonding site to R.sup.1, L.sup.1 represents a single bond or a hydrocarbon group having 1 to 36 carbon atoms which may have a substituent, and —CH.sub.2— included in the hydrocarbon group may be replaced by —O—, —S—, —CO— or —SO.sub.2—, R.sup.2 represents a saturated hydrocarbon group having 1 to 12 carbon atoms, u1 represents an integer of 0 to 2, s1 represents 1 or 2, t1 represents 0 or 1, in which s1+t1 is 1 or 2, n represents an integer of 2 or more, and a plurality of X.sup.1, L.sup.1, s1, t1, R.sup.2 and u1 each may be the same or different from each other.

The present invention provides a heterocyclic compound having an orexin type 2 receptor agonist activity.

A compound represented by the formula (I):

##STR00001##

wherein each symbol is as described in the specification, or a salt thereof has an orexin type 2 receptor agonist activity, and is useful as an agent for the prophylaxis or treatment of narcolepsy.

The present invention provides a heterocyclic compound having an orexin type 2 receptor agonist activity.

A compound represented by the formula (I):

##STR00001##

wherein each symbol is as described in the specification, or a salt thereof has an orexin type 2 receptor agonist activity, and is useful as an agent for the prophylaxis or treatment of narcolepsy.

The present invention provides a heterocyclic compound having an orexin type 2 receptor agonist activity. A compound represented by the formula (I): ##STR00001##
wherein each symbol is as described in the specification, or a salt thereof has an orexin type 2 receptor agonist activity, and is useful as an agent for the prophylaxis or treatment of narcolepsy.

The present invention provides a heterocyclic compound having an orexin type 2 receptor agonist activity. A compound represented by the formula (I): ##STR00001##
wherein each symbol is as described in the specification, or a salt thereof has an orexin type 2 receptor agonist activity, and is useful as an agent for the prophylaxis or treatment of narcolepsy.

A polyimide precursor including at least one repeating unit represented by the following chemical formula (1): ##STR00001## in which A is an arylene group; and X.sub.1 and X.sub.2 are each independently hydrogen, an alkyl group having 1 to 6 carbon atoms, or an alkylsilyl group having 3 to 9 carbon atoms, and a polyimide obtained from the polyimide precursor has a coefficient of linear thermal expansion from 50 C. to 400 C. of 100 ppm/K or less.

A polyimide precursor including at least one repeating unit represented by the following chemical formula (1): ##STR00001## in which A is an arylene group; and X.sub.1 and X.sub.2 are each independently hydrogen, an alkyl group having 1 to 6 carbon atoms, or an alkylsilyl group having 3 to 9 carbon atoms, and a polyimide obtained from the polyimide precursor has a coefficient of linear thermal expansion from 50 C. to 400 C. of 100 ppm/K or less.

The present invention provides a heterocyclic compound having an orexin type 2 receptor agonist activity.

A compound represented by the formula (I):

##STR00001##

wherein each symbol is as described in the specification, or a salt thereof has an orexin type 2 receptor agonist activity, and is useful as an agent for the prophylaxis or treatment of narcolepsy.