Higuchi et. al, " N-Hydroxymethyl Derivatives of Nitrogen Heterocylcles as Possible Prodrugs II: Possible Prodrugs of Allopurinol, Glutethimide, and Phenobarbital,", 1981, Box: 11, Folder: 21. Personal papers of Takeru Higuchi, PP 359. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/124655 Accessed December 30, 2024.