You can find a statistical analysis and an alphabetical listing of compounds below this table.
Reviews of PPAP structures: Ciochina 2006, X.-W. Yang 2018
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compounds with any all of the following characteristics: bicyclo[3.3.1]nonanes (including more highly cyclized and seco derivatives) bicyclo[3.2.1]octanes (including more highly cyclized derivatives) bicyclo[2.2.2]octanes (including more highly cyclized and seco derivatives) other bridged bicyclics spiroindanes spiropentalanes other spiro compounds compounds exo at C(7) compounds endo at C(7) compounds with two C(3) substituents compounds with no C(7) substituent compounds with no C(3) substituent compounds with an acyloxy substituent at C(3) type A compounds type B compounds uncaged compounds caged compounds seco and nor compounds compounds with enamines replacing carbonyls