3 isopropyl 2 4 dimethyl 2 pentene July 8, 2019 16 32 64 128 3 isopropyl 2 4 dimethyl 1 pentene 2 3-dimethyl-2-pentene 2 3-dimethyl pent-2-ene 2 3-dimethyl-1-pentene 3 3 dimethyl 2 pentanol