| abstract |
A conjugated polyprenylcarboxylic acid and its derivative having the formula: <IMAGE> in which each of n and m is 0, 1 or 2, n+m is 1 or 2, A is <IMAGE> and R is the hydroxyl group, a lower alkoxy group or <IMAGE> wherein each of R1 and R2 represents the hydrogen atom, a lower alkyl group, or an aryl group; provided that R is <IMAGE> if A is <IMAGE> n is 1 and m is 0. |