1HDC:
reference: Mechanism of inhibition of 3 alpha, 20 beta-hydroxysteroid dehydrogenase by a licorice-derived steroidal inhibitor., Ghosh D, Erman M, Wawrzak Z, Duax WL, Pangborn W, Structure 1994 Oct 15;2(10):973-80. PMID: 7866748

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