The identity of the gas was never disclosed Reveal_secret , although it is believed by some to have been a fentanyl derivative , such as carfentanil .

Protesters called Name_conferral themselves `` çapulcu '' ( looters ) , reappropriating Erdoğan 's insult Judgment_communication for themselves ( and coined the derivative `` chapulling '' , given Giving the meaning of `` fighting Hostile_encounter for your rights '' ) .