This serves as the reducing agent. It can convert carbonyl groups into methylene groups (CH2).
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2-bromo-4-phenyl-4-butanolide
Benzoic acid 17-hydroxy-10,13-dimethyl-3-oxo-2,3,6,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-2-yl ester