Representative amino- hydroxyamino-, nitroso-, and nitrosugar-containing bacterial secondary metabolites - viriplanins A (1) and D (2) from Ampullariella regularis, respinomycins A (3) and D (4) from Streptomyces xanthocidicus, calicheamicin γI1 (5) from Micromonospora echinospora, arisostatins A (6) and B (7) from Micromonospora sp. TP-AO316, streptozotocin (8) from Streptomyces achromogenes, and evernimicin variants - aminosugar analog (11), hydroxylaminosugar analog (12), nitrososugar analog (13), everninomicin D (14) and Sch 49088 (15) from Micromonospora carbonacea.