Patent ID: 7521004

Claim:
A chromene compound having an indeno(2,1-f)naphtho(1,2-b)pyran structure represented by the following formula: as a basic skeleton, wherein a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group is bonded, as a substituent, to a carbon atom at the seventh position of the pyran structure; an aliphatic monocyclic ring, which may have a lower alkyl group having not more than 4 carbon atoms as a substituent, is spiro-bonded to a carbon atom at the thirteenth position of the pyran structure; and an alkoxy group or a p-alkylaminophenyl group having a Hamett number in a range of −0.49 to −0.2 is bonded to a carbon atom at the sixth position of the pyran structure.