1-Vinyl-2-pyrrolidinone polymer with methyl methacrylate and allyl methacrylate 2-Propenoic acid, 2-methyl-, endo- 2-Pyrrolidinone, 1-ethenyl-, polymer with methyl 2-methyl-2-propenoate and 2-propenyl 2-methyl-2-propenoate 38809-73-3 Duragel 75 Permaflex Naturals Surfilcon A Surfilcon A [USAN]