[1] Pharmacology Department,
[2] National Center for Scientific Research,undefined
[3] CNIC,undefined
[4] P.O. Box 6990,undefined
[5] Havana,undefined
[6] Cuba,undefined
[7] Fax +53 7 330497,undefined
[8] e-mail: ricardo@quimica.cneuro.cu,undefined
[9] Pharmacy and Foods Faculty,undefined
[10] University of Havana,undefined
[11] Ave. 23,undefined
[12] No. 21425,undefined
[13] La Coronela,undefined
[14] Havana,undefined
[15] Cuba,undefined