1 AR1 (2-{[4-({4-[(4-formylamino-1-methyl-1h-imidazole-2-carbonyl)-amino]-1-methyl-1h-imidazole-2-carbonyl}-amino)-1-methyl-1 H-imidazole-2-carbonyl]-amino}-ethyl)-dimethyl-ammonium 1.000 2 DMY Distamycin a 0.707