The present invention provides compounds of the following structure,
wherein R.sub.1, R.sub.2, R.sub.4, R.sub.4', R.sub.6, R.sub.7, and
R.sub.15 are defined above: These compounds are useful in treating
neurological disorders or complications due to stroke or head injury;
benign or malignant neoplastic disease, carcinomas and adenocarcinomas;
proliferative disorders; and inflammatory disorders. The compounds are
therefore useful as neuroprotective and neuroregenerative,
anti-proliferative, and anti-inflammatory agents.