Fig. 3

Molecular structures of the representative compounds. Mass spectrum of the compounds obtained by GC–MS analysis of three Streptomyces spp. were compared with the WILEY 09 and NIST14 mass spectral databases. S. rochei (a1–8): (a1) 2,4-Di-Tert-butylphenol, (a2) Phenyl acetic acid, (a3) Gibberellic acid (GA), (a4) Palmitic acid, (a5) Ethanol, 2-(Octadecyloxy), (a6) Cholestanol, (a7) 2-methylene, & (a8) Hexadecenoic acid (Erucic acid). S. griseus (b1–8): (b1) Indole, (b2) Naphthalene, 2-ethenyl, (b3) Methanone, Bis-4-phenoxyphenyl, (b4) 1,2-benzenedicarboxylic acid (Phthalate), b5) Oleic acid, (b6) Thiocarbamic acid, (b7) O-Methylated Flavone, (Flavonoid or Genkwanin & (b8) 9-Octadecenoic acid (Oleic Acid). and S. sampsonii (c1–8): (c1) 1,2-Benzenedicarboxylic acid (Phthalic acid), (c2) Naphthalene, 1,6-Dimethyl-4-(1-Methylethyl), (b3) 3-Methyl-butyric acid (b4) Eugenol phenol,2-Methoxy-4-(2-Propenyl). (c5) 2,6-Ditert-butylbenzo-1,4-Quinone, (c6) 2 h-Naphthol, Octahydro-dimethyl, (c7) Heptanol and (c8) Hexane-1-carboxylic acid