Patent 7211589 was granted and assigned to Eisai (company) on May, 2007 by the United States Patent and Trademark Office.
The present invention provides a novel compound exhibiting an excellent suppressing effect to cell injury caused by radicals and neurotoxicity induced by excitatory nuerotransmitters such as glutamate. Specifically, it provides a compound represented by the following formula, a salt thereof or a hydrate of them.