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Sekiya, M.; Takayama, S.; Ito, K.; Suzuki, J.; Suzuki, K.; Terao, Y., Formic acid reduction: xv. reaction of n-methyl and n-formyl derivatives of p-phenylenediamine with formates. n-methylation of formanilides., Chem. Pharm. Bull., 1972, 20, 2661-8. [all data]