The present application relates to a nitrogen-containing compound. The structural formula of the nitrogen-containing compound is as shown in a Formula 1, in which a ring A and a ring B are each independently selected from a benzene ring or a fused aromatic ring with 10 to 14 ring-forming carbon atoms, and at least one of the ring A and the ring B is selected from the fused aromatic ring with 10 to 14 ring-forming carbon atoms; L is selected from a single bond, a substituted or unsubstituted arylene group with 6 to 30 carbon atoms, and a substituted or unsubstituted heteroarylene group with 3 to 30 carbon atoms; and Het is a substituted or unsubstituted nitrogen-containing heteroaryl group with 3 to 30 carbon atoms. The nitrogen-containing compound of the present application can improve the luminous efficiency of an organic electroluminescent device and the conversion efficiency of a photoelectric conversion device using the nitrogen-containing compound.

##STR00001##

The present application relates to a nitrogen-containing compound. The structural formula of the nitrogen-containing compound is as shown in a Formula 1, in which a ring A and a ring B are each independently selected from a benzene ring or a fused aromatic ring with 10 to 14 ring-forming carbon atoms, and at least one of the ring A and the ring B is selected from the fused aromatic ring with 10 to 14 ring-forming carbon atoms; L is selected from a single bond, a substituted or unsubstituted arylene group with 6 to 30 carbon atoms, and a substituted or unsubstituted heteroarylene group with 3 to 30 carbon atoms; and Het is a substituted or unsubstituted nitrogen-containing heteroaryl group with 3 to 30 carbon atoms. The nitrogen-containing compound of the present application can improve the luminous efficiency of an organic electroluminescent device and the conversion efficiency of a photoelectric conversion device using the nitrogen-containing compound.

##STR00001##

The present invention relates to a compound represented by Formula 1 wherein A, B, L, X, and R.sub.1 to R.sub.6 are as described herein, or a pharmaceutically acceptable salt thereof, which serves as a GLP-1 receptor agonist and may be useful in the prevention or treatment of a disease associated with GLP-1 activity.

The present invention relates to a compound represented by Formula 1 wherein A, B, L, X, and R.sub.1 to R.sub.6 are as described herein, or a pharmaceutically acceptable salt thereof, which serves as a GLP-1 receptor agonist and may be useful in the prevention or treatment of a disease associated with GLP-1 activity.

The present invention relates to compounds suitable for use in electronic devices, and to electronic devices, especially organic electroluminescent devices, comprising these compounds.

The present invention relates to compounds suitable for use in electronic devices, and to electronic devices, especially organic electroluminescent devices, comprising these compounds.

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 description, 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 description, 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 relates to compounds expected to be useful in the prevention and/or treatment of diseases such as amyotrophic lateral sclerosis, frontotemporal dementia, chronic traumatic encephalopathy, Alzheimer's disease, frontotemporal lobar degeneration, multisystem proteinopathy and the like, a method for preventing or treating such diseases, and the like.

The present invention relates to compounds expected to be useful in the prevention and/or treatment of diseases such as amyotrophic lateral sclerosis, frontotemporal dementia, chronic traumatic encephalopathy, Alzheimer's disease, frontotemporal lobar degeneration, multisystem proteinopathy and the like, a method for preventing or treating such diseases, and the like.