1,3-Butadiene, 2-methyl-, homopolymer 2-Methyl-1,3-butadiene, homopolymer 29717-43-9 29896-30-8 9003-31-0 Betaprene H HSDB 747 Isoprene D Isoprene oligomer Isoprene polymer Isoprene, polymers POLYISOPRENE Poly(2-methyl-1,3-butadiene) Poly-1-methylbutenylene cis-1,4-Polyisoprene trans-Polyisoprene