(Octahydro-4,7-methano-1H-indenediyl)bis(methylene) bismethacrylate 2-Propenoic acid, 2-methyl-, (octahydro-4,7-methano-1H-indene-5,?-diyl)bis(methylene) ester 43048-08-4 EINECS 256-062-6