4OSO:
reference: Structure-Based Engineering of Angucyclinone 6-Ketoreductases., Patrikainen P, Niiranen L, Thapa K, Paananen P, Tahtinen P, Mantsala P, Niemi J, Metsa-Ketela M, Chem Biol. 2014 Sep 3. pii: S1074-5521(14)00249-X. doi:, 10.1016/j.chembiol.2014.07.017. PMID: 25200607

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