Final refinement statistics for PDT crystallized with 8,9-dihydro-9-oxoimidazo[2,1-b]purine.

aR factor = Σhkl||Fobs |−k|Fcal||/Σhkl|Fobs| where Fobs and Fcal are observed and calculated structure factors, respectively.bFor Rfree the sum is extended over a subset of reflections (5%) excluded from all stages of refinement.Final refinement statistics for PDT crystallized with 8,9-dihydro-9-oxoimidazo[2,1-b]purine.a) R因子（R factor）的定义式为：所有hkl衍射点的||F_obs| − k|F_cal||之和与所有hkl衍射点的|F_obs|之和的比值，其中F_obs与F_cal分别代表观测结构因子与计算结构因子。b) 自由R因子（Rfree）的求和范围限定为从所有精修（refinement）阶段中均被排除的5%衍射点子集。针对以8,9-二氢-9-氧代咪唑并[2,1-b]嘌呤结晶的PDT的最终精修统计数据。