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Structures of the single compounds used for bioassays with domestic cats. Two dimensional structures are shown on the left, 3D structures are shown on the right. Oxygen atoms are shown in red, nitrogen in blue. Nepetalactone (1) and epinepetalactone (2) are also referred to as cis-trans-nepetalactone and trans-cis-nepetalactone, respectively. Note how the location of the carbonyl group is different between the type I lactones 7–8 and the type II lactones 1–6
