[1] UNIV UPPSALA,UPPSALA BIOMED CTR,DEPT ORGAN PHARMACEUT CHEM,S-75123 UPPSALA,SWEDEN
[2] UNIV UPPSALA,UPPSALA BIOMED CTR,DEPT MED PHARMACOL,S-75123 UPPSALA,SWEDEN
[3] GOTHENBURG UNIV,DEPT STRUCT CHEM,S-40033 GOTHENBURG,SWEDEN
[4] UNIV STOCKHOLM,ARRHENIUS LAB,DEPT ORGAN CHEM,S-10691 STOCKHOLM,SWEDEN
[5] UNIV ARIZONA,COLL PHARM,DEPT PHARMACOL & TOXICOL,TUCSON,AZ 85721