cyclic olefin Dicyclopentadiene PPDB:225 KEGG:C14411 0 132.203 CHEBI:34695 HECLRDQVFMWTQS-UHFFFAOYSA-N 132.09390 Dicyclopentadiene C10H12 chebi_ontology C1C=CC2C3CC(C=C3)C12 CAS:77-73-6 InChI=1S/C10H12/c1-2-9-7-4-5-8(6-7)10(9)3-1/h1-2,4-5,7-10H,3,6H2