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Biological Activity: 6:2 Fluorotelomer alcohol (6:2 FTOH) is an orally active, blood-brain barrier-permeable modulator of cyclin D1 and ETS1. 6:2 Fluorotelomer alcohol downregulates cyclin D1 expression, upregulates ETS1 via the TNF-α/ERK 1/2 pathway, impairs mitochondrial membrane potential and respiratory function, increases reactive oxygen species levels, disrupts calcium homeostasis and activates endoplasmic reticulum stress markers, and induces cell proliferation inhibition and endothelial-mesenchymal transition. Furthermore, 6:2 Fluorotelomer alcohol induces morphological abnormalities in zebrafish embryos and liver developmental damage, while disrupting the brain immune microenvironment in mice, causing systemic toxicity and delayed pup maturation in CD-1 mice. 6:2 Fluorotelomer alcohol also induces cortical neuron apoptosis, glial cell activation, synaptic abnormalities, colonic barrier damage, intestinal dysbiosis and autism spectrum disorder-like symptoms in mice. 6:2 Fluorotelomer alcohol shows no mutagenic, clastogenic, primary skin/eye irritation or skin sensitizing effects, exhibits no selective reproductive toxicity in CD-1 mice, and is classified as GHS Category 4 for acute oral toxicity. 6:2 Fluorotelomer alcohol can be used in studies of neurodevelopmental disorders and autism spectrum disorders^{[1][2][3][4][5]}.