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(A) Chemical structures described in the text. (B) Overall biosynthetic pathways to rebeccamycin, staurosporine, and cladoniamide A. R1 = H, R2 = Cl, R3 = O in rebeccamycin pathway; R1,R2 = H, R3 = 2H in the staurosporine pathway; R1 = Cl, R2 = H, R3 = O in the cladoniamide A pathway.
