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Trivial names contain no clues to the structures; one must learn the name and associate it with a separately learned structure. The names typically derive from a common source of the compound or the source from which it was first isolated. For example, palmitic acid is found in palm oil, oleic acid is a major constituent of olive oil (oleum) and stearic (from the Greek word meaning solid) acid is solid at room temperature. Spiders (arachnids) contain arachidonic acid.