NOVELTY - A pyrrolopyridine compound (I) is new.    USE - Pyrrolopyridine compound is used for light absorption material, mechanochromic material, organic semiconductor material and light emission agent for organic electroluminescent element used for display panel and information display equipment (all claimed), blue light emitting diode, blue semiconductor laser, hole transport material, electron transport material, printing ink, label, biosensor, chemical sensor, pressure sensor, label and pressure indicator. Uses include but are not limited to organic solar cell, organic transistor, organic semiconductor memory, organic thin film sensor actuator, pressure sensitive recording material, stress distribution index marker, etc.    ADVANTAGE - The pyrrolopyridine compound has excellent thermal stability, electrical conductivity and organic semiconductor characteristics. The organic electroluminescent element formed using the pyrrolopyridine compound has excellent luminous efficiency and durability.    DETAILED DESCRIPTION - A pyrrolopyridine compound of formula (I) is new.    X=structure in which one or more aromatic rings and/or heteroaromatic rings chosen from monocyclic or condensed polycyclic aromatic rings and monocyclic or condensed polycyclic heteroaromatic rings are bonded with each other;    R1=H or substituent;    R2-R5=H or substituent;and    n=1 or 2.    The bonding position of each substituent is one of ortho position, meta position and para position of each phenyl group to which the substituent is bonded. (i) When substituents are bonded at two or more positions among the ortho position, the meta position and the para position of each phenyl group, the substituents adjacent to each other combines together and form a cyclic structure together with a carbon atom to which the substituents are bonded; (ii) when X is benzene ring, R1 coupled with benzene ring is substituent; (iii) when n is 2, pyrrolopyridine compound is dimerized through X and R1 does not exist. An INDEPENDENT CLAIM is included for organic electroluminescent element, which is formed using organic semiconductor material containing the pyrrolopyridine compound (I).    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic view of organic electroluminescent element.    Substrate (1)    Anode (2)    Hole injection/hole transport layer (3)    Light emitting layer (4)    Electron injection/electron transport layer (5)    Cathode (6)