Sec-butomidate is an anesthetic drug related to etomidate, which has been sold as a designer drug as an active ingredient in e-cigarette liquids marketed under names such as space oil or kpods. It has a sec-butyl ester group in place of the ethyl ester of etomidate.[1][2][3][4]
^Fan Y, Chen X, Wu H, Ke X, Chen H, Xu Y, et al. (November 2025). "Leveraging mass spectrometry fragmentation patterns for accelerated screening and structural elucidation of new etomidate analogues in suspect samples". Journal of Pharmaceutical and Biomedical Analysis. 265 117023. doi:10.1016/j.jpba.2025.117023. PMID40532400.
^Bai S, Qian Z, Chen Y, Liu S, Wang F, Liu F (September 2025). "Traceability of etomidate and its analogs in biological samples using "specific" metabolites". Analytical Methods. 17 (36): 7207–7216. doi:10.1039/D5AY00773A. PMID40879556.