Keywords: Tetracyclo(3.2.0.02,7.04,6)heptane numbering.svg Structure of tetracyclo3 2 0 02 7 04 6heptane Own 2014-03-24 Emeldir <span class signature-talk >talk</span> File Tetracyclo 2 2 1 02 6 03 5 heptane numbering svg PD-chem Chemical structures to explain nomenclature |