List of benzimidazole opioids - Wikipedia
https://en.wikipedia.org/wiki/List_of_benzimidazole_opioids
Synthetic opioid nitazene linked to rise in overdose deaths is emerging in Australia - ABC News
https://www.abc.net.au/news/2024-06-25/nitazines-synthetic-opioid-warning-australia-overdose-deaths/104013774