Figure F28. Partial ion chromatogram at m/z 191 (hopanoid hydrocarbons) from Sample 306-U1312A-3H-4, 145–150 cm. Ts = 22,29,30-trinorneohopane, Tm = 22,29,30-trinorhopane, X = contaminant. 17α(H) indicates isomerization at C17, S and R refer to side-chain isomerization.
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