158252-90-5 2-Propenoic acid, 2-methyl-, 2-methylpropyl ester, polymer with butyl 2-propenoate, 2-propenyl 2-methyl-2-propenoate and rel-(1R,2R,4R)-1,7,7-trimethylbicyclo(2.2.1)hept-2-yl 2-methyl-2-propenoate