“…Procaine (191) and several of its derivatives, particularly p-nitro procainamides (192), have good protective activity. In this connection, l-phenyl-lacetthio-2-nitroethane and its higher homolog were active in mice, while the corresponding amino compound, 1 -phenyl-2-aminoethanethiol, was inactive (193). 4-H ydroxybutyric acid and 6-phosphonogluconolactone, substances which stimulate turnover of NADP.…”