2-Propenoic acid, 2-methyl-, 2-hydroxyethyl ester, polymer with pentyl 2-methyl-2-propenoate, ethenyl acetate, ethenyl propanoate, and 3-hydroxy-2-maphthalenyl 2-methyl-2-propenoate; 58167-74-1 Mafilcon A Mafilcon A [USAN]