Cells were grown on 10 cm dishes and incubated with the compounds for 24 h in full media. The protocol for extraction of Mito-Met analogs was the same as previously described, but without BHT (16 (link)). LC-MS/MS analyses were performed using a Kinetex Phenyl-Hexyl column (50 mm × 2.1 mm, 1.7 μm, Phenomenex) equilibrated with water:acetonitrile mixture (4:1) containing 0.1% formic acid. Compounds were eluted by increasing the content of acetonitrile from 20% to 100% over 4 min and detected using the MRM mode.