Table 4 Pentacyclic triterpenoid compounds identified in the two studied charcoal-bearing samples from 88-m- and 93-m-depth of borehole RMB#2 in the Rajmahal Basin. The peak assignment (peak number) is according to Fig. 12 below
Peak number | Compound | Base peak | Molecular ion |
|---|---|---|---|
1 | 30-Norhopane | 191 | 398 |
2 | 17α(H)-22,29,30-Trisnorhopane (Tm) | 191 | 370 |
3 | 17β(H)-22,29,30-Trisnorhopane | 149 | 370 |
4 | 30-Norneohop-13(18)-ene | 191 | 396 |
5 | 30-Norhopane | 191 | 398 |
6 | 17β(H),21α(H)-30-Norhopane | 177 | 398 |
7 | αβ-Hopane | 191 | 412 |
8 | Neohop-13(18)-ene isomer | 191 | 410 |
9 | 17β(H),21β(H)-30-Norhopane | 177 | 398 |
10 | αβ-Hopane | 191 | 412 |
11 | 17α(H),21β(H)-Homohopane (22 S) | 191 | 426 |
12 | 17α(H),21β(H)-Homohopane (22 R) | 191 | 424 |
13 | ββ-Hopane | 191 | 412 |
14 | 17β(H),21β(H)-Homohopane | 205 | 426 |
15 | 17β(H),21β(H)-30,31-Bishomohopane | 219 | 440 |