4-acetoxy MPT is a tryptamine that induces the head-twitch response (HTR) in mice[1].
References
[1] Klein AK, et al. Investigation of the Structure-Activity Relationships of Psilocybin Analogues. ACS Pharmacol Transl Sci. 2020 Dec 14;4(2):533-542. DOI:10.1021/acsptsci.0c00176