CUX cux 2-[[7-[(2~{R},3~{R},4~{S},5~{R})-5-[(~{R})-(4-chlorophenyl)-oxidanyl-methyl]-3,4-bis(oxidanyl)oxolan-2-yl]pyrrolo[2,3-d]pyrimidin-4-yl]amino]ethanal CUX