3-carene, a colorless liquid hydrocarbon is a natural product and a component of turpentine most often measured in essential oils using GC/FID.
6-methyl-5-hepten-2-one is a hydrocarbon liquid found in lemon oil and used in perfumes and flavoring agents. It is most often measured using GC/FID, PID and GC/MS.
p-cymene (p-isopropyl toluene) is an aromatic hydrocarbon liquid used in solvents and resin manufacturing. It is most often measured using GC/PID, FID and GC/MS.