Figure 1. Chemical structure and stereo-configuration of the stereoisomers of diadenosine 5′,5″″-P¹,P⁴-dithio-P²,P³-chloromethylenetetraphosphate (compound 1), and of adenosine 5′-(P¹-thio-P²,P³-chloromethylenetriphosphate), (compound 2).

R_P and S_P designate the absolute configuration of chiral P¹- and P⁴-phosphorothioates; r and s, the absolute configuration of the pseudo-asymmetric carbon of the P²,P³-chloromethylene group in compound 1; R and S, the absolute configuration of the chloromethylene group in compound 2. Ade, 5′-adenosyl; N.A., Not Asymmetric.