... REFERENCES AND NOTES [la] On leave from the Department of Chemistry, Kasetsart Universi- ty, Bangkok, Thailand; [b] Present address: Hoechst-Celanese, Provi- dence, RI; [с] Present ... [11] S. Letellier and B. Fleury, / Heterocyclic Chem., 25 ... J. Pharmacol., 69, 29 (1980). ...