2-Propenoic acid, 2-methyl-, methyl ester, polymer with 1-ethenyl-2-pyrrolidinone 25655-01-0 82148-18-3 Astifilcon A Astifilcon A [USAN] Breath-O Methyl methacrylate polymer with 1-vinyl-2-pyrrolidinone Poly(methylmethacrylate-N-vinylpyrrolidone) Vinyl pyrrolidone, methyl methacrylate polymer