Table 1.

Alkylated thiophenes identified in the TMAH‐assisted pyrolysates of Libros microstructures and sedimentary matrix

1	2‐methylthiophene
2	3‐methylthiophene
3	2‐ethylthiophene
4	2,5‐dimethylthiophene
5	2,4‐dimethylthiophene
6	2,3‐dimethylthiophene
7	3,4‐dimethylthiophene
8	2‐propylthiophene
9	2‐ethyl‐5‐methylthiophene
10	2‐ethyl‐4‐methylthiophene
11	Ethylmethylthiophene
12	2,3,5‐trimethylthiophene
13	2,3,4‐trimethylthiophene
14	C8H12S†
15	C6H6O2S‡
16	C7H8O2S§

Numbers refer to Fig. 2; †Mixture of 2‐methyl‐5‐propylthiophene, 2,5‐diethylthiophene, 2‐butylthiophene, 2‐ethyl‐3,5‐dimethylthiophene, ethyldimethylthiophene and/or 5‐ethyl‐2,3‐dimethylthiophene; ‡Mixture of methyl‐2‐thiophene carboxylate and methyl‐3‐thiophene carboxylate; §Mixture of methyl‐5‐methyl‐2‐thiophene carboxylate and methyl‐3‐methyl‐2‐thiophene carboxylate.