The 4'-methyl ester of pyrldoxlne is reported to have antlvltamin properties [5]; pyrlditol (the dlsulflde of the pyrldoxlne thlol analog) has weak antlvltamln activity and is psychopharmacologically active. We have studied the 4'-methyl ester of pyrlditol (1) using neuropharmacologlcal screening tests [6], and compared it with pyrldltol, which we studied earlier; using the methods described in [7], we also studied its effect on the withdrawal of 4 ...