In Toxicologic Pathology,
Vol. 33, No. 6, 2005, page 721 (Greijdanus – van der Putten et al., Drug-Induced Protoporphyria in Beagle Dogs), the correct structural formula of the described compound (a heterocyclic drug (4-[(4-fluorophenyl)-4-chlorothienyl-2-methylene]-methylpiperidinebutane-1,4-dioate)) should be: