13C NMR STUDY ON 2,4-DIAMINO-5-METHYL-6-SUBSTITUTED-BENZYL PYRIDO-(2,3d) PYRIMIDINES
Feng Chunmei, Qiao Liang, Gao Congyuan, Zhang Yi, Li Renli
Chinese Journal of Magnetic Resonance . 1993, (2): 177 -184 .