Labile examples of these compounds are isolated with the assistance of a vacuum pump in a technique called SAFE. The FD factor describes the last dilution at which one of these compounds is detectable, and is determined through the procedure AEDA (“A-E-D-A”). These compounds are analyzed in a two stage procedure whose first stage is gas chromatography and whose second stage is a panel of human assessors. Fixatives called resinoids are added to mixtures of these compounds to equalize their (*) volatilities, thus increasing the tenacity of the mixture. These compounds are often isolated by performing steam distillation on a sample of crushed plant matter. More volatile examples of these compounds are used as top notes, (10[1])while less volatile ones are used as middle or base notes. For 10 points, name these compounds detectable (-5[1])by the human olfactory system. (10[1])■END■