SEARCH Articles Figures Tables Cis- Polyisoprene structure Cis-1,4-Polyisoprene with benzophenone Cis-l,4-Polyisoprene Natural rubber (cis-1,4-polyisoprene Polyisoprene Polyisoprenes Rubber cis-1 ,4-Polyisoprene Structural Characterization of Naturally Occurring cis-Polyisoprenes Structure of Naturally Occurring Cis-Polyisoprenes