Prostaglandins, peptidomimetic compounds, and retinoids -- Drugs based on a substituted benzene ring -- Indenes, naphthalenes, and other polycyclic aromatic compounds -- Steroids; pt. 1 : estranes, gonanes, and androstanes -- Steroids; pt. 2 : compounds related to progesterone, cortisone, and cholesterol -- Nonsteroidal sex hormones and their antagonists -- Opioid anagesics -- Drugs based on five-membered heterocycles -- Drugs based on six-membered heterocycles -- Five-membered heterocycles fused to a benzene ring -- Six-membered heterocycles fused to a benzene ring -- Seven-membered heterocycles fused to benzene -- Heterocyles fused to two aromatic rings -- Beta lactam antibiotics -- Heterocycles fused to other heterocyclic rings