And the dimer spiroanthracene deriv., using these optical information recording method and informat

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PROBLEM TO BE SOLVED : To provide a compound usable for a display or a recording material, a re-writable optical information-recording medium by using the same, and a method for recording or erasing the optical information. SOLUTION : This anthracene derivative is expressed by general formula [wherein, (n) is an integer of 1 to 20], and its dimer is also provided. COPYRIGHT : (C)2010, JPO&INPIT