3 Polycyclic aromatic and hydroaromatic compounds References
4 Steroids References
5 Five-membered heterocycles 1 Compunds with one heteroatom 2 Compounds with two heteroatom 3 Compounds with three heteroatom References
6 Six-membered heterocycles 1 Compounds with one ring heteroatom 2 Compounds with two heteroatom 3 Rings containing three heteroatom References
7 Five-membered benzoheterocycles 1 Benzene rings fused to rings containing two heteroatom References
8 Six and seven-membered benzoheterocycles 1 Six-membered benzoheterocycles containing one ring heteroatom 2 Six-membered benzoheterocycles containing two heteroatoms 3 Benzene fused to seven-membered ring heterocycles References