4,4'-双甲氧基三苯甲基氯 、
Diphenyl-carbamic acid 4-(dibutylamino-methyleneamino)-7-((2R,4S,5R)-4-hydroxy-5-hydroxymethyl-tetrahydro-furan-2-yl)-7H-pyrrolo[2,3-d]pyrimidin-2-yl ester 以51%的产率得到Diphenyl-carbamic acid 7-{(2R,4S,5R)-5-[bis-(4-methoxy-phenyl)-phenyl-methoxymethyl]-4-hydroxy-tetrahydro-furan-2-yl}-4-(dibutylamino-methyleneamino)-7H-pyrrolo[2,3-d]pyrimidin-2-yl ester