5-á-Hydroxy-á-2-pyridylbenzyl-7-á-2-pyridylbenylidene norborn-5- ene-2, 3-dicarboximide

5-á-Hydroxy-á-2-pyridylbenzy-7-á-2-pyridylbenzylidène-norborn-5- ène-2,3-dicarboximide; nobormide m