
Uncommon steranes in Brazilian marginal crude oils: Dinoflagellate molecular fossils in the Sergipe-Alagoas Basin, Brazil
Keywords: Steroidal hydrocarbons; 23,24-Dimethyl steranes; Dinosteranes; 3β-Alkyl steranes; Sergipe-Alagoas Basin; GCÃGC-TOFMS; Two-dimensional gas chromatography;