16α,17α-(2-Oxobutane-1,4-diyl)pregn-4-ene-3,20-dione
16α,17α-(2-Oxobutane-1,4-diyl)pregn-4-ene-3,20-dione ??
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16α,17α-(2-Oxobutane-1,4-diyl)pregn-4-ene-3,20-dione ?? ?? ? ???
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16α,17α-(2-Oxobutane-1,4-diyl)pregn-4-ene-3,20-dione ?? ??
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