An object of the present invention is to provide an organic electroluminescent element having optimal light emitting characteristics. The above problem is solved by an organic electroluminescent element having a light emitting layer containing a compound of formula (1) or a multimer compound having a plurality of structures of formula (1) and a compound of formula (2).

##STR00001##

(In formula (1), ring A, ring B, and ring C each represent an aryl ring or the like, X.sup.1 and X.sup.2 each independently represent O or N—R, and the R represents an aryl or the like. In formula (2), R.sup.1 to R.sup.10 each represent an aryl or the like.)

An object of the present invention is to provide an organic electroluminescent element having optimal light emitting characteristics. The above problem is solved by an organic electroluminescent element having a light emitting layer containing a compound of formula (1) or a multimer compound having a plurality of structures of formula (1) and a compound of formula (2).

##STR00001##

(In formula (1), ring A, ring B, and ring C each represent an aryl ring or the like, X.sup.1 and X.sup.2 each independently represent O or N—R, and the R represents an aryl or the like. In formula (2), R.sup.1 to R.sup.10 each represent an aryl or the like.)

An organic electroluminescence device includes: an anode; a cathode; a first emitting layer; and a second emitting layer provided between the first emitting layer and the cathode, in which the first emitting layer contains, as a first host material, a first compound that has at least one group represented by a formula (11A) below and that is represented by a formula (1) below, the second emitting layer contains, as a second host material, a second compound represented by a formula (2) below, and the first emitting layer and the second emitting layer are in direct contact with each other

##STR00001##

An organic electroluminescence device includes: an anode; a cathode; a first emitting layer; and a second emitting layer provided between the first emitting layer and the cathode, in which the first emitting layer contains, as a first host material, a first compound that has at least one group represented by a formula (11) below and that is represented by a formula (1) below, the second emitting layer contains, as a second host material, a second compound represented by one of formulae (2-1A) to (2-4A) below, and the first emitting layer and the second emitting layer are in direct contact with each other.

##STR00001## ##STR00002##

An organic electroluminescence device includes: an anode; a cathode; a first emitting layer; and a second emitting layer provided between the first emitting layer and the cathode, in which the first emitting layer contains, as a first host material, a first compound that has at least one group represented by a formula (11) below and that is represented by a formula (1) below, the second emitting layer contains, as a second host material, a second compound represented by one of formulae (2-1A) to (2-4A) below, and the first emitting layer and the second emitting layer are in direct contact with each other.

##STR00001## ##STR00002##

To provide a novel photoelectric conversion device that is highly convenient, useful, or reliable. The photoelectric conversion device includes a first electrode, a second electrode, and a first unit. The first unit is located between the first electrode and the second electrode. The first unit contains a first electron-donating material and a first electron-accepting material. The first electron-donating material is a condensed aromatic compound, and the first electron-accepting material has a perylene skeleton and two or more alkyl groups. The alkyl groups each independently have 1 to 13 carbon atoms.

To provide a novel photoelectric conversion device that is highly convenient, useful, or reliable. The photoelectric conversion device includes a first electrode, a second electrode, and a first unit. The first unit is located between the first electrode and the second electrode. The first unit contains a first electron-donating material and a first electron-accepting material. The first electron-donating material is a condensed aromatic compound, and the first electron-accepting material has a perylene skeleton and two or more alkyl groups. The alkyl groups each independently have 1 to 13 carbon atoms.

Provided herein, inter alia, are compound and methods of treating cancer by inhibiting HDAC8.

Provided herein, inter alia, are compound and methods of treating cancer by inhibiting HDAC8.

An organic light-emitting device includes a condensed cyclic compound represented by Formula 1, where at least one of X.sub.4 to X.sub.11 is C(R.sub.x), and R.sub.x is a group represented by Formula 2: ##STR00001## The condensed cyclic compound represented by Formula 1 has a planar conformation because of the single bond linking the 8 and 8′ positions of the spirobifluorene moiety. Accordingly, the condensed cyclic compound may provide the organic light-emitting device with suitable hole mobility and thermal stability.