Fig. 5. Gas chromatograph–mass spectrometry (GC–MS) data of the biomarker C30–17
(H), 21ß(H)-hopane in commercial standard (a) and oil residue (b). The MS spectra of C30–17(H), 21ß(H)-hopane is shown in (c).
Fig. 5. Gas chromatograph–mass spectrometry (GC–MS) data of the biomarker C30–17(H), 21ß(H)-hopane in commercial standard (a) and oil residue (b). The MS spectra of C30–17(H), 21ß(H)-hopane is shown in (c).