Mexoprofen was studied as an analgesic agent. This compound has never been marketed.

Metesind (AG-331) is a lipophilic thymidylate synthase inhibitor. It inhibits the cofactor binding site of the enzyme. It exerts cytotoxic properties. Metesind was being developed as an anticancer and antimetabolite agent.

Vapendavir (BTA-798) is an orally active capsid-binding inhibitor. It is a potent, orally bioavailable, broad spectrum inhibitor of the large group of HRVs. Vapendavir binds tightly to VP1s canyon and disrupts the ability of the capsid to bind to a specific cell surface receptor. This further inhibits the release of the viral RNA into the cell cytoplasm during the viral uncoating process (removing the lipid bilayer), thereby disrupting viral replication. Vapendavir is designed to be dosed orally. Vapendavir is in phase II clinical trials for the treatment of rhinovirus-induced aggravation of pre-existing asthma or COPD. Vapendavir has shown significant results in proof-of-concept studies. Thus far, from the Phase 1/2 studies conducted, vapendavir has demonstrated a desirable clinical pharmacology profile with high bioavailability, linear pharmacokinetic profile, remained unaffected by concomitant medications, and was not exclusively metabolized.

Cletoquine is a metabolite of a disease-modifying anti-rheumatic and antimalarial drug hydroxychloroquine. It is produced by oxidative N-deethylation of hydroxychloroquine.

FLOPRISTIN is one of the components of the experimental drug NXL103 (XRP 2868), along with linopristin. Both are semi-synthetic streptogramin antibiotics derived from the Streptomyces genus. NXL103 has a spectrum of antibacterial activity that indicates it has the potential to be effective in the treatment of skin and skin structure infections, including those caused by methicillin-resistant Staphylococcus aureus, as well as community-acquired pneumonia. NXL103 has completed Phase II trials.

Derpanicate is cholesterol inhibitor. It was developed for the treatment of hyperlipidaemia. Preregistration was discontinued in Italy and Switzerland.