Naturally-occurring fatty acids R CH2 CH CH CH2 CH CH CH2 C OH O 7 6 5 4 3 1. Cis form 2. Not conjugated - isolated double bond. 3. Even numbered fatty acids.Naturally-occurring fatty acids R CH2 CH CH CH2 CH CH CH2 C OH O 7 6 5 4 3 1. Cis form 2. Not conjugated - isolated double bond. 3. Even numbered fatty acids