Original sentence: Volatile sulfonamide PFOS precursors include N-methyl perfluorooctane sulfonamidoethanol (MeFOSE), a carpet stain repellent, and N-ethyl perfluorooctane sulfonamidoethanol (EtFOSE), a paper treatment
Edited sentence: Volatile sulfonamide PFOS precursors include N-methyl perfluorooctane sulfonamidoethanol (N-MeFOSE), a carpet stain repellent, and N-ethyl perfluorooctane sulfonamidoethanol (N-EtFOSE), a paper treatment