| http://www.w3.org/ns/prov#value | - More particularly, the invention relates to a polyprenyl compound of the formula (I): ##STR1## wherein A, B, Y and Z are each hydrogen, or the pair (1) A and B and/or the pair (2) Y and Z together represent a direct valence bond between the carbon atoms to which they are attached, thereby forming a double bond therebetween; W is a group of --COR or a group of X; and n is zero or an integer of 1 to
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