+----+---------------+---------+-------------+
| id | ext_id        | cod_id  | relation_id |
+----+---------------+---------+-------------+
|  1 | Ibuprofen     | 2006278 |           1 |
|  2 | Caffeine      | 2100202 |           1 |
|  3 | Serotonin     | 2019147 |           1 |
|  4 | Pristinamycin | 1000001 |           1 |
|  5 | Cucurbituril  | 1516465 |           1 |
|  6 | Rubrene       | 1516682 |           1 |
+----+---------------+---------+-------------+