(Z)-2-Pentene (Z)-Pent-2-ene 2-Pentene, (2Z)- 2-Pentene, (Z)- 33064-87-8 627-20-3 EINECS 210-988-7 HSDB 5725 beta-Amylene-cis cis-2-PENTENE cis-Pentene cis-beta-Amylene cis-beta-N-Amylene