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(A) Indolocabazoles AT2433 (1, X = H or Cl), rebeccamycin (2) and staurosporine (3). (B) Aminopentose-containing enediynes calicheamicin (4), and esperamicin (5) where R1 = methyl, ethyl or isopropyl. (C) Proposed biosynthetic pathway of aminodideoxypentose shared by 1, 4 and 5. The aminodideoxypentose common to 1, 4 and 5 is highlighted in panels A and B (boxed and in blue) and the putative AtmS13 reaction is highlighted within the box in panel C.
