perfluorobutanesulfonic acid molecule, pfbs, molecular structure, 3d model van der waals

perfluorobutanesulfonic acid pfbs pfas molecule molecular structure chemical formula isolated model c4hf9o3s atom toxic chemistry composition compound safety science atomic fluorocarbon fluorosurfactant surfactant scientific butanesulfonic perfluoro skeletal drawing line synthetic pollutant research substance geometric poison solid stable structural element organic persistent