International Minerals and Chemical Corporation
Patent: US3953597 A1, 1976 ;

Shinkai, I.; Zwan, M. C. Vander; Hartner, F. W.; Reamer, R. A.; Tull, R. J.; Weinstock, L. M.
Journal of Heterocyclic Chemistry, 1981 , vol. 18, p. 197 - 198