[1] UNIV CALIF SAN FRANCISCO, SCH PHARM, DEPT PHARMACEUT CHEM, SAN FRANCISCO, CA 94143 USA
[2] UNIV CALIF SAN FRANCISCO, MED INFORMAT SCI SECT, SAN FRANCISCO, CA 94143 USA
[3] UNIV CALIF SAN FRANCISCO, SCH MED, DEPT BIOCHEM & BIOPHYS, SAN FRANCISCO, CA 94143 USA