Disclosed are compounds of Formula (I′), methods of using the compounds as immunomodulators, and pharmaceutical compositions comprising such compounds. The compounds are useful in treating, preventing or ameliorating diseases or disorders such as cancer or infections. ##STR00001##

The present invention is directed to an efficient process for preparing benzoxazole derivatives comprising the step of reacting a 4-Amino-3-hydroxybenzoic acid compound of Formula III with a 3,5-Dichlorophenyl ortho ester compound of Formula I to provide the compound of Formula I

##STR00001##

wherein R.sup.1, R.sup.2a, R.sup.2b and R.sup.2c are as described herein.

The present invention is directed to an efficient process for preparing benzoxazole derivatives comprising the step of reacting a 4-Amino-3-hydroxybenzoic acid compound of Formula III with a 3,5-Dichlorophenyl ortho ester compound of Formula I to provide the compound of Formula I

##STR00001##

wherein R.sup.1, R.sup.2a, R.sup.2b and R.sup.2c are as described herein.

Provided are a compound of formula (I-a), an isomer thereof or a pharmaceutically acceptable salt thereof as a Hemagglutinin inhibitor, and a preparation method thereof. The compound is useful for preparing a medicament for treating a disease related to Hemagglutinin.

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Provided are a nitrogen-containing compound, an organic electroluminescent device and an electronic apparatus. The nitrogen-containing compound has a structure as shown in chemical formula 1; Ar.sub.1 and Ar.sub.2 are the same or different, and each is independently selected from a substituted or unsubstituted C6-C30 aryl, or a substituted or unsubstituted C3-C30 heteroaryl; and R.sub.0 is selected from hydrogen, a C1-C6 alkyl, a substituted or unsubstituted C6-C30 aryl, or a substituted or unsubstituted C3-C30 heteroaryl. The nitrogen-containing compound acts as a hole transporting material or a host material of a luminescent layer and can effectively improve the performance of organic electroluminescent devices.

##STR00001##

Provided are a nitrogen-containing compound, an organic electroluminescent device and an electronic apparatus. The nitrogen-containing compound has a structure as shown in chemical formula 1; Ar.sub.1 and Ar.sub.2 are the same or different, and each is independently selected from a substituted or unsubstituted C6-C30 aryl, or a substituted or unsubstituted C3-C30 heteroaryl; and R.sub.0 is selected from hydrogen, a C1-C6 alkyl, a substituted or unsubstituted C6-C30 aryl, or a substituted or unsubstituted C3-C30 heteroaryl. The nitrogen-containing compound acts as a hole transporting material or a host material of a luminescent layer and can effectively improve the performance of organic electroluminescent devices.

##STR00001##

Disclosed is a highly efficient organic light-emitting device that uses an anthracene derivative having a characteristic structure as a host compound in a light-emitting layer of the organic light-emitting device and includes a capping layer formed using a compound having a characteristic structure in the organic light-emitting device.

Disclosed is a highly efficient organic light-emitting device that uses an anthracene derivative having a characteristic structure as a host compound in a light-emitting layer of the organic light-emitting device and includes a capping layer formed using a compound having a characteristic structure in the organic light-emitting device.

The present invention provides a dental curable composition that shows fluorescence sufficient to enable highly aesthetic harmonious restoration almost indistinguishable from surrounding natural teeth, and that, while having sufficient mechanical strength and radiopacity and good ease of polishing as a restorative material, desirably resists discoloration not only in the intraoral environment but under accelerated heating conditions and under xenon light, without losing fluorescence even under these conditions. The present invention also provides a cured product of such a dental curable composition. The present invention relates to a dental curable composition comprising a polymerizable monomer (A), an inorganic filler (B), a polymerization initiator (C), and a fluorescent agent (D), wherein the fluorescent agent (D) comprises a 9- to 11-membered benzo-fused heterocyclic compound containing two or more heteroatoms (excluding benzoimidazole compounds).

Embodiments of the disclosure relate to an organic light emitting element. Specifically, there may be provided an organic light emitting element having high efficiency or long lifespan by including a first electrode, a second electrode, and an organic material layer positioned therebetween wherein the organic material layer includes a specific compound.