Table 3 List of the compounds identified in the bitumen samples analyzed by GC–MS procedure

TR23

C23 Tricyclic terpane

TR24

C24 Tricyclic terpane

TR25

C25 Tricyclic terpane

TET24

C24 Tetracyclic terpane

Ts

18α(H),21β(H)-22,29,30-Trisnorhopane

Tm

17α(H),18α(H),21β(H)-22,29,30-Trisnorhopane

MeH29

2α-methyl-17α(H),21β(H)-30-Norhopane

H28

17α(H),18α(H),21β(H)-28,30-Bisnorhopane

C29stig

C29-20S-5α(H),14α(H),17α(H)-Stigmastane

C29-20R-5α(H),14β(H),17β(H)-Stigmastane

C29-20S-5α(H),14β(H),17β(H)-Stigmastane

C29-20R-5α(H),14α(H),17α(H)-Stigmastane

H29

17α(H),21β(H)-30-Norhopane

MeH30

2α-methyl-17α(H),21β(H)-Hopane

C29Ts

17α(H),21β(H)-30-Norneohopane

M29

17β(H),21α(H)-30-Norhopane (normoretane)

OL

18α(H)- and 18β(H)-oleanane

H30

17α(H),21β(H)-Hopane

MeH31

2α-methyl-17α(H),21β(H)-30-Homohopane

H31S

22S-17α(H),21β(H)-30-Homohopane

MeH32

2α-methyl-17α(H),21β(H)-30,31-Bishomohopane

H31R

22R-17α(H),21β(H)-30-homohopane

GAM

Gammacerae

H32S

22S-30,31-Bishomohopane

H32R

22R-30,31-Bishomohopane

H33S

22S-17α(H),21β(H)-30,31,32-Trishomohopane

H33R

22R-17α(H),21β(H)-30,31,32-Trishomohopane

H34S

22S-17α(H),21β(H)-30,31,32,33-Tetrakishomohopane

H34R

22R-17α(H),21β(H)-30,31,32,33-Tetrakishomohopane

H35S

22S-17α(H),21β(H)-30,31,32,33,34-Pentakishomohopane

H35R

22R-17α(H),21β(H)-30,31,32,33,34-Pentakishomohopane

BHC35

C35 Benzohopane

S22

C21 5α(H),14α(H),17α(H)-sterane

C27ααS

C27 20S-5α(H),14α(H),17α(H)-cholestane

C27ββR

C27 20R-5α(H),14β(H),17β(H)-cholestane

C27ββS

C27 20S-5α(H),14β(H),17β(H)-cholestane

C27ααR

C27 20R-5α(H),14α(H),17α(H)-cholestane

C28ααS

C28 20S-5α(H),14α(H),17α(H)-ergostane

C28ββR

C28 20R-5α(H),14β(H),17β(H)-ergostane

C28ββS

C28 20S-5α(H),14β(H),17β(H)-ergostane

C28ααR

C28 20R-5α(H),14α(H),17α(H)-ergostane

C29ααS

C2920S-5α(H),14α(H),17α(H)-stigmastane

C29ββR

C2920R-5α(H),14β(H),17β(H)-stigmastane

C29ββS

C2920S-5α(H),14β(H),17β(H)-stigmastane

C29ααR

C29 20R-5α(H),14α(H),17α(H)-stigmastane