Description: 435 chemistry: molecular biology and microbiology / 435 chemistry: molecular biology and microbiology/(41) micro-organism, tissue cell culture or enzyme using process to synthesize a desired chemical compound or composition (52) preparing compound containing a cyclopentanohydrophenanthrene nucleus; nor-, homo-, or d-ring lactone derivatives thereof (54) acting on d-ring (55) acting at 17-position (56) hydroxylating at 17-position
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