BCL2L1 and cancer: The densitometric analysis of Bcl‐xL expression in MOLT‐4 and RS4;11 cancer cell lines, found a two‐fold degradation potency of PP5 over DT2216 (DC50 values are shown in Table 2).[37] As PP5 was a racemic mixture, therefore was resolved into its epimers: S‐epimer (PZ703a) and R‐epimer (PZ703b).