(3β,4α,5α)-17-Hydroxyethoxy-androstan-3,4-diol is an intermediate used in the synthesis of (3β,4α,5α)-3,4-Dihydroxyandrostan-17-one (D450108), which is a product from the microbial transformation of 4-Hydroxy-4-cholesten-3-one and 4-Hydroxy-4-androstene-3,17-dione by Mycobacterium phei under aerobic conditions.