Patent ID: 8110596

Claim:
A triprenyl phenol compound of the following formula (II) or (III): wherein, in Formula (II), R 1 is an aromatic group having as a substituent or as a part of a substituent at least one group selected from the group consisting of a carboxyl group, a hydroxyl group, a sulfonic acid group and a secondary amino group, X is —CHY—C(CH 3 ) 2 Z; and Y and Z are respectively —H or —OH, or together form a single bond; wherein, in Formula (III), R 4 is an aromatic amino acid residue of the following formula (III-1) (provided that tyrosine residue and phenylalanine residue are excluded); X is —CHY—C(CH 3 ) 2 Z; and Y and Z are respectively —H or —OH, or together form a single bond, wherein R 5 is a substituent which may be present or absent and which is selected from the group consisting of a hydroxyl group, a carboxyl group and an alkyl group having 1 to 5 carbon atoms, and wherein n represents an integer of 0 or 1.