A compound with anti-drug resistant bacteria activity having the following formula (I):

##STR00001##

is disclosed. R.sub.1 and R.sub.2 are each independently H, alkyl, or phenyl, or R.sub.1 and R.sub.2 form —(CH.sub.2).sub.3—, —(CH.sub.2).sub.4—, or —(CH.sub.2).sub.5—, and R.sub.3 is —COOCH.sub.2CH.sub.3, or CN. A method of preparing the compound of formula (I) is also disclosed.

A compound with anti-drug resistant bacteria activity having the following formula (I):

##STR00001##

is disclosed. R.sub.1 and R.sub.2 are each independently H, alkyl, or phenyl, or R.sub.1 and R.sub.2 form —(CH.sub.2).sub.3—, —(CH.sub.2).sub.4—, or —(CH.sub.2).sub.5—, and R.sub.3 is —COOCH.sub.2CH.sub.3, or CN. A method of preparing the compound of formula (I) is also disclosed.

The present disclosure relates to an organic electroluminescent compound, an organic electroluminescent material and an organic electroluminescent device comprising the same, a plurality of host materials comprising at least one first host material and at least one second host material, and an organic electroluminescent device comprising the same. By comprising the compound according to the present disclosure as a single host material or as a plurality of host materials, it is possible to produce an organic electroluminescent device having improved driving voltage, luminous efficiency, and/or lifetime properties compared to the conventional organic electroluminescent devices.

The present disclosure relates to an organic electroluminescent compound, an organic electroluminescent material and an organic electroluminescent device comprising the same, a plurality of host materials comprising at least one first host material and at least one second host material, and an organic electroluminescent device comprising the same. By comprising the compound according to the present disclosure as a single host material or as a plurality of host materials, it is possible to produce an organic electroluminescent device having improved driving voltage, luminous efficiency, and/or lifetime properties compared to the conventional organic electroluminescent devices.

The present disclosure relates to an organic electroluminescent compound, and an organic electroluminescent device comprising the same. By comprising the organic electroluminescent compound according to the present disclosure, it is possible to provide an organic electroluminescent device having improved current efficiency and/or lifetime properties.

The present disclosure relates to an organic electroluminescent compound, and an organic electroluminescent device comprising the same. By comprising the organic electroluminescent compound according to the present disclosure, it is possible to provide an organic electroluminescent device having improved current efficiency and/or lifetime properties.

A compound is represented by Chemical Formula 1.

##STR00001##

In Chemical Formula 1, G, R.sup.1, R.sup.2, R.sup.3, X.sup.1, Ar.sup.1 and Ar.sup.2 are each the same as in the specification.

A compound is represented by Chemical Formula 1.

##STR00001##

In Chemical Formula 1, G, R.sup.1, R.sup.2, R.sup.3, X.sup.1, Ar.sup.1 and Ar.sup.2 are each the same as in the specification.

The present invention generally relates to various polycyclic aromatic selenoxide compounds, methods for preparing these compounds, and methods of us these and other compounds to generate ground state atomic oxygen.

The present invention generally relates to various polycyclic aromatic selenoxide compounds, methods for preparing these compounds, and methods of us these and other compounds to generate ground state atomic oxygen.