Patent ID: 6852830

Claim:
A thiophene compound represented by formula (I): in which A represents a C 1-5 -alkylene bridge; R represents a —R 1 —(C═O)—R 2 group; —R 1 — represents a —R 3 — or —R 4 —X—R 5 — group; R 2 is hydrogen, a hydroxy group, a thiol group, —NR 6 R 7 , —OR 8 or a —SR 9 group; R 3 , R 4 and R 5 are independently an alkylene group or an arylene group; X is a —O—, —S— or ═NR 10 ; R 6 and R 7 are independently hydrogen, an optionally substituted amino group or an optionally substituted alkyl group; R 8 and R 9 are independently an optionally substituted alkyl group (optionally with at least one substituent selected from the group consisting of an alcohol, amide, ether, ester or sulfonate group), an optionally substituted aryl group or a —SiR 11 R 12 R 13 group; R 10 is an alkyl, aryl or acyl group; and R 11 , R 12 and R 13 are independently an optionally substituted alkoxy or alkyl group.