Six different secalonic acids were tested for cytostatic activity against cultured mouse leukaemia L1210 cells. Secalonic acids B and E showed rather weak activity but the other four isomers showed quite strong activity, especially secalonic acids A and D which were slightly more active than adriamycin. The chemically rearranged 2,4'-dimer of secalonic acid A showed almost the same activity as the naturally isolated 2,2'-dimer, but the activity of the 4,4'-dimer was much stronger than that of both the 2,2'-dimer and adriamycin. Interestingly, in a mouse bone marrow stem cell assay, secalonic acids F and G showed almost the same toxicity as adriamycin, but secalonic acids A and D showed rather weak toxicity. Similarly, the 2,2'-dimer of secalonic acid A showed almost the same toxicity as adriamycin, but the toxicity of the 2,4'- and 4,4'-dimers was weaker than that of the 2,2'-dimer and also that of adriamycin.
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