5.1.7 Product Subclass 7: Germylenes
5.2.24.10 Arylstannanes (Update 2021)
6.1.29.16 a-Boryl Carbonyl Compounds (Update 2021)
6.1.43 Product Subclass 43: Azaborines (Borazines)
14.6.5 Thiopyrylium Salts (Update 2021)
27.27 Product Class 27: 1,2-Diimines
27.28 Product Class 28: ß-Diketimines (1,3-Diimines)
40.1.8 Product Subclass 8: Piperazines
48.3.3 Cyclobutanes (Update 2021)