Compound for organic electroluminescent device and organic electroluminescent device

A compound for an organic electroluminescent device represented by the following general formula (I):

• wherein,
• ring a is an aromatic ring condensed with two adjacent rings and represented by formula (a1) and X is CH;
• ring b is a heterocyclic ring condensed with two adjacent rings and represented by formula (b1),
• Ar is a trivalent aromatic hydrocarbon group or a trivalent aromatic heterocyclic group,
• L is independently a substituted or unsubstituted aromatic hydrocarbon group or a substituted or unsubstituted heterocyclic group and at least one has a condensed ring structure;
• R is independently hydrogen, alkyl group, aralkyl group, alkenyl group, alkynyl group, cyano group, dialkylamino group, diarylamino group, diaralkylamino group, amino group, nitro group, acyl group, alkoxycarbonyl group, carboxyl group, alkoxyl group, alkylsulfonyl group, haloalkyl group, hydroxyl group, amide group, a substituted or unsubstituted aromatic hydrocarbon group, or a substituted or unsubstituted aromatic heterocyclic group.