How can I calculate D value from D' and R sqaure?

Question

[mandecent.gupta]

Hi,

I have data file generated after using SNAP.

SNP    Proxy    Distance    RSquared    DPrime    Arrays    Chromosome    Coordinate_HG18    GeneVariant    GeneName    GeneDescription    Major    Minor    MAF    NObserved
rs9627183    rs9627183    0    1.000    1.000    AN,A5,A6,AxM,E1,E11,O5E,OEE,AAE    chr22    46663178    INTERGENIC    N/A    N/A    G    A    0.050    120
rs9627183    rs80226347    172    0.826    1.000    None    chr22    46663350    N/A    N/A    N/A    C    T    0.042    120

How can I calculate D from Rsqare and Dprime as this is needed for my calculation?

Thanks