The present invention provides a triprenyl phenol compound represented by the following formula (II) and (III) and having a thrombolysis-enhancing activity, and an efficient method for producing the triprenyl phenol compound. In formula (II) and (III), R.sup.1 represents an aromatic group having as a substituent or as a part of a substituent at least one member selected from the group consisting of a carboxyl group, a hydroxyl group, a sulfonic acid group and a secondary amino group, or an aromatic group which comprises a secondary amino group and may comprise nitrogen; R.sup.4 in the general formula (III) represents an aromatic amino acid residue represented by the general formula (III-1) below; X represents --CHY--(CH.sub.3).sub.2Z; and Y and Z are respectively --H or --OH or together form a single bond: (III-1) wherein R.sup.5 represents a hydroxyl group which may be present or absent; and n represents an integer of 0 or 1. ##STR00001##