CPV code 24321220 designates Unsaturated cyclic hydrocarbons in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
24321220 sits under 24321200 (Unsaturated hydrocarbons) and groups 6 more specific sub-codes. When classifying a tender, choose the narrowest code that still covers the full subject of the contract.