3d image of octafluorocyclobutane skeletal formula

octafluorocyclobutane 946 perfluorocyclobutane freon-c-318 freon organofluorine compound gas number cyclobutane perfluorinated analogue dimerization tetrafluoroethylene semiconductor etchant refrigerant ozone depleting chlorofluorocarbon dielectric 3d substance matter material component agent stuff reagent functional group precursor synthesis reaction production building block environmental environment anthropogenic hera biodegradation bioaccumulating toxic pollutant pollution damage non-biodegradable organic rcra naaqs