Catalysis of the reaction: 3-hydroxy-9,10-secoandrosta-1,3,5(10)-triene-9,17-dione + NADPH + H+ + O2 = 3,4-dihydroxy-9,10-secoandrosta-1,3,5(10)-triene-9,17-dione + NADP+ + H2O.
Source:http://purl.uniprot.org/go/0034819
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