Phellandrenes are a pair of organic compounds that have a similar molecular structure and similar chemical properties. I±-Phellandrene and �²-phellandrene are cyclic monoterpenes and are double-bond isomers. In I±-phellandrene, both double bonds are endocyclic and in I-phellandrene, one of them is exocyclic. Appearance: Colorless oil (I± and I) EC Number: (I±): 202-792-5; (I): 209-081-9; ...