All

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 D02 Organic Chemicals D009930 +
  D02.455 Hydrocarbons D006838 +
   D02.455.426 Hydrocarbons, Cyclic D006844 +
    D02.455.426.392 Hydrocarbons, Alicyclic D006840 +
     D02.455.426.392.368 Cycloparaffins D003516 +
      D02.455.426.392.368.450 Cyclopentanes D003517 +
       D02.455.426.392.368.450.350 Cycloleucine D003515 
 D12 Amino Acids, Peptides, and Proteins D000602 +
  D12.125 Amino Acids D000596 +
   D12.125.072 Amino Acids, Cyclic D000598 +
    D12.125.072.170 Cycloleucine D003515