Patent ID: 8916071

Claim:
A chromene compound having a basic skeleton represented by the following formula (1): wherein (i) Each of R 1 and R 2 is a sulfur-containing substituent represented by the following formula (2); in the above formula, ring X represented by the following formula is an aromatic hydrocarbon ring or aromatic heterocyclic ring, R 3 and R 4 are each independently an alkyl group, haloalkyl group, cycloalkyl group, alkoxy group, amino group, heterocyclic group containing a ring member nitrogen atom and bonded to the ring X bonded thereto via the nitrogen atom, halogen atom, aryloxy group or aryl group, “a” is an integer of 0 to 4, and when “a” is 2 to 4, a plurality of R 4 's may be the same or different; (ii) R 1 is a sulfur-containing substituent represented by the above formula (2) and R 2 is a hydrogen atom, hydroxyl group, alkyl group, haloalkyl group, cycloalkyl group, alkoxy group, amino group, heterocyclic group containing a ring member nitrogen atom and bonded to the 7-position carbon atom via the nitrogen atom, cyano group, nitro group, formyl group, hydroxycarbonyl group, alkylcarbonyl group, alkoxycarbonyl group, halogen atom, aralkyl group, aralkoxy group, aryloxy group or aryl group; or (iii) R 2 is a sulfur-containing substituent represented by the above formula (2) and R 1 is a hydrogen atom, hydroxyl group, alkyl group, haloalkyl group, cycloalkyl group, alkoxy group, amino group, heterocyclic group containing a ring member nitrogen atom and bonded to the 6-position carbon atom via the nitrogen atom, cyano group, nitro group, formyl group, hydroxycarbonyl group, alkylcarbonyl group, alkoxycarbonyl group, halogen atom, aralkyl group, aralkoxy group, aryloxy group or aryl group.