Patent ID: 7026512

Claim:
A compound represented by formula (I): wherein A represents CH or N; R 1 represents hydrogen and R 6 represents —CH 2 C(R 7 )(OH)CH 2 OR 8 ; or R 1 represents and R 6 represents —CH 2 C(R 7 )(OH)CH 2 OR 8 ; or R 1 represents —CH 2 C(R 7 )(OH)CH 2 OR 8 and R 6 represents an alkyl or alkenyl group having C 4 –C 36 carbon atoms; or R 1 represents hydrogen and R 6 represents —CH 2 C(R 7 )(OH)R 8 ; or R 1 represents and R 6 represents —CH 2 C(R 7 )(OH)R 8 ; or R 1 represents —CH 2 C(R 7 )(OH)R 8 and R 6 represents an alkyl or alkenyl group having C 4 –C 36 carbon atoms; R 2 and R 3 each represent hydrogen or an alkyl or alkenyl group having C 1 –C 6 carbon atoms; R 4 and R 5 each represent an alkyl group having C 1 –C 6 carbon atoms when A represents N; or R 4 and R 5 together represent a C 2 –C 5 alkylene group when A represents N; or R 4 and R 5 together represent a C 2 –C 5 alkylene group containing NR 10 or NR 11 when A is CH or N, where R 10 is hydrogen or an alkyl group having C 1 –C 4 carbon atoms and R 11 is an alkyl group having C 1 –C 4 carbon atoms or R 7 represents hydrogen or an alkyl or alkenyl group having C 1 –C 5 carbon atoms; R 8 represents an alkyl or alkenyl group having C 4 –C 36 carbon atoms or —COR 9 , where R 9 represents an alkyl or alkenyl group having C 3 –C 35 carbon atoms; and n is an integer from 1 to 3, and where the compound is acid-blocked.