6NKO:
reference: Identification of the Formycin A Biosynthetic Gene Cluster from Streptomyces kaniharaensis Illustrates the Interplay between Biological Pyrazolopyrimidine Formation and de Novo Purine Biosynthesis., Wang SA, Ko Y, Zeng J, Geng Y, Ren D, Ogasawara Y, Irani S, Zhang Y, Liu HW, J Am Chem Soc. 2019 Apr 8. doi: 10.1021/jacs.9b00241. PMID: 30942582

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